No, 318 is not a prime number. It is a composite number: it is even, so it is divisible by 2.
318 has divisors other than 1 and itself. The smallest is 2: 318 ÷ 2 = 159.
Prime factorization: 318 = 2 × 3 × 53.
| Number | Prime? |
|---|---|
| 314 | No, 2 × 157 |
| 315 | No, 3 × 3 × 5 × 7 |
| 316 | No, 2 × 2 × 79 |
| 317 | Yes |
| 319 | No, 11 × 29 |
| 320 | No, 2 × 2 × 2 × 2 × 2 × 2 × 5 |
| 321 | No, 3 × 107 |
| 322 | No, 2 × 7 × 23 |
Another number? Use the prime number checker for any value, or see the list of prime numbers.