# Prime Factor

A prime factor is a divisor that is also a prime number.

Prime factor is an elementary-school-level concept. It is listed in the California State Standards for Grade 5.

### Prerequisites

Divisor: | An integer that divides a given integer with no remainder. A synonym for factor. |

Prime Number: | A prime number is a positive integer that has exactly one positive integer divisor other than 1 (i.e., no factors other than 1 and itself). Prime numbers are often simply called primes. |