No, 308 is not a prime number. It is a composite number: it is even, so it is divisible by 2.
308 has divisors other than 1 and itself. The smallest is 2: 308 ÷ 2 = 154.
Prime factorization: 308 = 2 × 2 × 7 × 11 = 2² × 7 × 11.
| Number | Prime? |
|---|---|
| 304 | No, 2 × 2 × 2 × 2 × 19 |
| 305 | No, 5 × 61 |
| 306 | No, 2 × 3 × 3 × 17 |
| 307 | Yes |
| 309 | No, 3 × 103 |
| 310 | No, 2 × 5 × 31 |
| 311 | Yes |
| 312 | No, 2 × 2 × 2 × 3 × 13 |
Another number? Use the prime number checker for any value, or see the list of prime numbers.