No, 398 is not a prime number. It is a composite number: it is even, so it is divisible by 2.
398 has divisors other than 1 and itself. The smallest is 2: 398 ÷ 2 = 199.
Prime factorization: 398 = 2 × 199.
| Number | Prime? |
|---|---|
| 394 | No, 2 × 197 |
| 395 | No, 5 × 79 |
| 396 | No, 2 × 2 × 3 × 3 × 11 |
| 397 | Yes |
| 399 | No, 3 × 7 × 19 |
| 400 | No, 2 × 2 × 2 × 2 × 5 × 5 |
| 401 | Yes |
| 402 | No, 2 × 3 × 67 |
Another number? Use the prime number checker for any value, or see the list of prime numbers.