P
Prime Number Calculator
Is it prime? If not, its smallest factor, and the primes just before and after it.
Result…
How it's calculated
n is prime if its only divisors are 1 and n. It is enough to test divisors up to √n.
A prime has exactly two divisors. Checking up to the square root is enough: any larger factor pairs with a smaller one already tested.
Your numbers, step by step
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