This app allows you to:

1) Check if your given number is a probable prime number using Fermat primality test.
2) Check if your given number is a probable prime number using Miller-Rabin primality test.
3) Check if your given number is a probable prime number using Baillie-PSW primality test.

It can checks primality of big numbers with hundreds of digits in no time. You can use arithmetic operators +,-,*,/,^ and parentheses to enter a number of a special form.