No, 231 is not a prime number. It is a composite number: its digits add up to 6, which is divisible by 3, so 231 is divisible by 3.
231 has divisors other than 1 and itself. The smallest is 3: 231 ÷ 3 = 77.
Prime factorization: 231 = 3 × 7 × 11.
| Number | Prime? |
|---|---|
| 227 | Yes |
| 228 | No, 2 × 2 × 3 × 19 |
| 229 | Yes |
| 230 | No, 2 × 5 × 23 |
| 232 | No, 2 × 2 × 2 × 29 |
| 233 | Yes |
| 234 | No, 2 × 3 × 3 × 13 |
| 235 | No, 5 × 47 |
More about 231: 231 in binary.
Another number? Use the prime number checker for any value, or see the list of prime numbers.