Fermat's little theorem states that if p is a prime number, then for any integer a, the a(p-1) (mod p)=1.
Let's check that, by setting modubelow to a prime number and m to modu-1. For example, we can set modu to 5, 7, 11, and 13, and m to 4, 6, 10, and 12. Then, we will observe that the output will be 1 (represented as an arrow pointing to 1)