What is prime95.exe?

The genuine prime95.exe file is a software component of Prime95 by Mersenne Research.
The 'prime95.exe' file belongs to the 'Great Internet Mersenne Prime Search (GIMPS) distributed computing project' that was developed by Mersenne Research, Inc. This executable runs the GIMPS project in Windows. The project's client software obtains computing type tasks from 'PrimeNet' server, which is the central GIMPS server. It then runs computations on the PC during CPU idle time. Lastly, it uploads the results to the server. GIMPS began in January 1996 with the goal of discovering newer, world record Mersenne primes.

PRIME95 stands for PRIME95 Application

The .exe extension on a filename indicates an executable file. Executable files may, in some cases, harm your computer. Therefore, please read below to decide for yourself whether the prime95.exe on your computer is a Trojan that you should remove, or whether it is a file belonging to the Windows operating system or to a trusted application.

Click to Run a Free Scan for prime95.exe related errors

Prime95.exe file information

The process known as PRIME95 Application belongs to software PRIME95 Application or Prime95 by unknown.

Description: Prime95.exe is not essential for the Windows OS and causes relatively few problems. Prime95.exe is located in a subfolder of "C:\Program Files" or sometimes in a subfolder of C:\. The file size on Windows 10/8/7/XP is 4,333,568 bytes. 
There is an icon for this program on the taskbar next to the clock. The program has a visible window. There is no description of the program. The process can be uninstalled in the Control Panel. The prime95.exe file is not a Windows core file. Prime95.exe is able to record keyboard and mouse inputs, hide itself and monitor applications. Therefore the technical security rating is 14% dangerous, however you should also read the user reviews.

Uninstalling this variant: You can uninstall the program using the Control Panel ⇒ Uninstall a ProgramPrime95.

Recommended: Identify prime95.exe related errors

Important: Some malware camouflages itself as prime95.exe, particularly when located in the C:\Windows or C:\Windows\System32 folder. Therefore, you should check the prime95.exe process on your PC to see if it is a threat. We recommend Security Task Manager for verifying your computer's security. This was one of the Top Download Picks of The Washington Post and PC World.


User Comments

Part of a distributed computing project to find large mersenne prime numbers. It uses spare CPU cycles & RAM.
  The Prowler   (further information)
Calculates prime numbers as a low priority service. Can connect to the internet to get new prime numbers and verify calculations completed.
  prime   (further information)
Program used to find large prime numbers, in a distributed computing environment
    (further information)
It is used for finding large prime numbers, part of the GIMPS distributed computing project.
  ixfd64   (further information)
Program for finding large prime numbers, often used for stress testing to ensure system stability
  Danny   (further information)
Distributed computing client for a public non-profit mathematical research project, uses spare CPU cycles so does not slow down anything. Also may be used as a system stability test. With default settings, neither uses much memory, nor affects laptop battery life (it pauses itself when on battery). On poorly cooled laptop in a hot environment overheating can be an issue, however.
  pazhosch   (further information)
A process was running on my computer called Prime95 and was using 90% of my CPU usage, sometimes even 100%. It could be malware disguised as prime95 but I would still get rid of it just incase. Not sure where to find it though.

Rating chart

Summary: Average user rating of prime95.exe: based on 12 votes with 7 user comments. 10 users think prime95.exe is essential for Windows or an installed application. 2 users suspect danger.

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Best practices for resolving prime95 issues

A clean and tidy computer is the key requirement for avoiding problems with prime95. This means running a scan for malware, cleaning your hard drive using cleanmgr and sfc /scannow, uninstalling programs that you no longer need, checking for Autostart programs (using msconfig) and enabling Windows' Automatic Update. Always remember to perform periodic backups, or at least to set restore points.

Should you experience an actual problem, try to recall the last thing you did, or the last thing you installed before the problem appeared for the first time. Use the resmon command to identify the processes that are causing your problem. Even for serious problems, rather than reinstalling Windows, you are better off repairing of your installation or, for Windows 8 and later versions, executing the DISM.exe /Online /Cleanup-image /Restorehealth command. This allows you to repair the operating system without losing data.

To help you analyze the prime95.exe process on your computer, the following programs have proven to be helpful: Security Task Manager displays all running Windows tasks, including embedded hidden processes, such as keyboard and browser monitoring or Autostart entries. A unique security risk rating indicates the likelihood of the process being potential spyware, malware or a Trojan. Malwarebytes Anti-Malware detects and removes sleeping spyware, adware, Trojans, keyloggers, malware and trackers from your hard drive.

Other processes

prime95.exe [all]