No, 345 is not a prime number. It is a composite number: it ends in 5, so it is divisible by 5.
345 has divisors other than 1 and itself. The smallest is 3: 345 ÷ 3 = 115.
Prime factorization: 345 = 3 × 5 × 23.
| Number | Prime? |
|---|---|
| 341 | No, 11 × 31 |
| 342 | No, 2 × 3 × 3 × 19 |
| 343 | No, 7 × 7 × 7 |
| 344 | No, 2 × 2 × 2 × 43 |
| 346 | No, 2 × 173 |
| 347 | Yes |
| 348 | No, 2 × 2 × 3 × 29 |
| 349 | Yes |
Another number? Use the prime number checker for any value, or see the list of prime numbers.