Why is 836475 not a prime number?

Answer 1

A number which is divisible by itself and 1 is called Prime number. A prime number has only two factors.

But, 836475 is also divisible by5, i.e. 836475 has more than two factors.

Therefore, the given number is not prime.

In order to show that given number is not prime there is no need to find all the factors, we should show that given number has more than two factors.