No, 315 is not a prime number. It is a composite number: it ends in 5, so it is divisible by 5.
315 has divisors other than 1 and itself. The smallest is 3: 315 ÷ 3 = 105.
Prime factorization: 315 = 3 × 3 × 5 × 7 = 3² × 5 × 7.
| Number | Prime? |
|---|---|
| 311 | Yes |
| 312 | No, 2 × 2 × 2 × 3 × 13 |
| 313 | Yes |
| 314 | No, 2 × 157 |
| 316 | No, 2 × 2 × 79 |
| 317 | Yes |
| 318 | No, 2 × 3 × 53 |
| 319 | No, 11 × 29 |
Another number? Use the prime number checker for any value, or see the list of prime numbers.