Prime Finder

Verify whether a number is a prime or not.

Enter Number

Please enter the number to check.


This tool checks whether the given number is a prime number or not. Numbers up to 16 digits are supported (e.g. 4163700612783683). The check is performed by dividing the number to check by all relevant factors, avoiding all multiples of 3 and 5 for performance.
Find more information and statistics about prime numbers in the prime numbers section of this website.