| − | A '''prime number''' is a [[natural number]] greater than 1 that is [[divisible]] by only 1 and itself. Equivalently, the number has exactly two [[factor]]s, 1 and itself, making primes an 'extreme' kind of number. On the opposite extreme from the primes are [[highly composite numbers]]. The first few prime numbers are 2, 3, 5, 7, 11, 13... | + | A '''prime number''' is a [[natural number]] greater than 1 that is [[divisible]] by only 1 and itself. Described another way, a prime number has only two [[factor]]s, 1 and itself. The first few prime numbers are 2, 3, 5, 7, 11, 13 .... The opposite of a prime number is a [[highly composite number]]. |