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Prime Numbers

Definition, table of primes up to 100, and a trainer for memorizing them.

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Prime Numbers — Key Facts

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Frequently Asked Questions

What are prime numbers?

A prime number is a natural number greater than 1 that is divisible only by 1 and itself. Examples: 2, 3, 5, 7, 11, 13...

What is the smallest prime number?

The smallest prime number is 2. It is the only even prime; all other primes are odd.

How many primes are there up to 100?

There are 25 primes up to 100: 2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89, 97.