No, 343 is not a prime number. It is a composite number: 343 = 7 × 49.
343 has divisors other than 1 and itself. The smallest is 7: 343 ÷ 7 = 49.
Prime factorization: 343 = 7 × 7 × 7 = 7³.
| Number | Prime? |
|---|---|
| 339 | No, 3 × 113 |
| 340 | No, 2 × 2 × 5 × 17 |
| 341 | No, 11 × 31 |
| 342 | No, 2 × 3 × 3 × 19 |
| 344 | No, 2 × 2 × 2 × 43 |
| 345 | No, 3 × 5 × 23 |
| 346 | No, 2 × 173 |
| 347 | Yes |
Another number? Use the prime number checker for any value, or see the list of prime numbers.