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A prime number is a whole number greater than 1 that is only divisible by 1 and the number itself. In other words, the only factors of a prime number are 1 and itself.
| Number | Factors | Prime? |
|---|---|---|
| 5 | 1 and 5 | ✓ |
| 6 | 1, 2, 3, and 6 | * |
| 7 | 1 and 7 | ✓ |
The set of prime numbers contains infinitely many numbers. The only even prime number is 2.