A factor that is a prime number: one of the prime numbers that, when multiplied, give the original number.

Example: The prime factors of 15 are 3 and 5 (3×5=15, and 3 and 5 are prime numbers).

Example: The prime factors of 15 are 3 and 5 (3×5=15, and 3 and 5 are prime numbers).

See: Prime Number