IsItPrime Icon



A small, basic, yet powerful and competent primality tester.

Add a Review
1 Download (This Week)
Last Update:
Download iipsrc61212.rar
Browse All Files
Windows Mac Linux



IsItPrime is a powerful, cross-platform, multi-threaded standalone application capable of testing massive numbers in several ways through a highly interactive and easily-understood user interface.

As of version 2.0.0, IsItPrime and other NCPrime applications no longer require the Visual C++ 2010 Redistributable for Windows. All NCPrime applications released after 1 November 2012 use the Qt framework and thus require Qt libraries (included) for cross-platform compatibility.

IsItPrime is in active development.

IsItPrime Web Site


  • Multithreaded
  • Saves detailed results files
  • Twitter integration
  • Friendly user interface

Update Notifications

Write a Review

User Reviews

Be the first to post a review of IsItPrime!

Additional Project Details


Chinese (Traditional), German

Intended Audience

Advanced End Users, Testers, Science/Research

User Interface

.NET/Mono, Qt, Win32 (MS Windows)

Programming Language

C, C++


Screenshots can attract more users to your project.
Features can attract more users to your project.

Icons must be PNG, GIF, or JPEG and less than 1 MiB in size. They will be displayed as 48x48 images.