No, 303 is not a prime number. It is a composite number: its digits add up to 6, which is divisible by 3, so 303 is divisible by 3.
303 has divisors other than 1 and itself. The smallest is 3: 303 ÷ 3 = 101.
Prime factorization: 303 = 3 × 101.
| Number | Prime? |
|---|---|
| 299 | No, 13 × 23 |
| 300 | No, 2 × 2 × 3 × 5 × 5 |
| 301 | No, 7 × 43 |
| 302 | No, 2 × 151 |
| 304 | No, 2 × 2 × 2 × 2 × 19 |
| 305 | No, 5 × 61 |
| 306 | No, 2 × 3 × 3 × 17 |
| 307 | Yes |
Another number? Use the prime number checker for any value, or see the list of prime numbers.