No, 408 is not a prime number. It is a composite number: it is even, so it is divisible by 2.
408 has divisors other than 1 and itself. The smallest is 2: 408 ÷ 2 = 204.
Prime factorization: 408 = 2 × 2 × 2 × 3 × 17 = 2³ × 3 × 17.
| Number | Prime? |
|---|---|
| 404 | No, 2 × 2 × 101 |
| 405 | No, 3 × 3 × 3 × 3 × 5 |
| 406 | No, 2 × 7 × 29 |
| 407 | No, 11 × 37 |
| 409 | Yes |
| 410 | No, 2 × 5 × 41 |
| 411 | No, 3 × 137 |
| 412 | No, 2 × 2 × 103 |
Another number? Use the prime number checker for any value, or see the list of prime numbers.