Prime Number Calculator

Check whether a number is prime.

Is it prime? Yes

Smallest factor (if not) —

Formula: test divisibility up to √n

Step-by-step with your numbers:

1. Values used:

2. Number = 97

4. Is it prime? = Yes

5. Smallest factor (if not) = —

Did we solve your problem today?

A prime number has exactly two divisors: 1 and itself.

The math behind it

Test divisibility by every number up to √n; if none divide it, it's prime.

97 is prime.

Is 1 prime?

No — primes need exactly two distinct divisors.