# How to check!

**URL:** <https://forum.kirupa.com/t/how-to-check/270836>\
**Category:** Uncategorized\
**Created:** [September 15, 2008, 7:20am UTC](https://forum.kirupa.com/t/how-to-check/270836 "2008-09-15T07:20:58Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![sahilali](https://avatars.discourse-cdn.com/v4/letter/s/858c86/32.png) [@sahilali](https://forum.kirupa.com/u/sahilali)\
**Post date:** [September 15, 2008, 7:20am UTC](https://forum.kirupa.com/t/how-to-check/270836/1 "2008-09-15T07:20:58Z")

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How to check whether a number is prime or not however it is arranged.  
e.g:- 113 , no matter how you arrange it, it will be prime, 131, 311, how to implement it in C# ??