No, 265 is not a prime number. It is a composite number: it ends in 5, so it is divisible by 5.
265 has divisors other than 1 and itself. The smallest is 5: 265 ÷ 5 = 53.
Prime factorization: 265 = 5 × 53.
| Number | Prime? |
|---|---|
| 261 | No, 3 × 3 × 29 |
| 262 | No, 2 × 131 |
| 263 | Yes |
| 264 | No, 2 × 2 × 2 × 3 × 11 |
| 266 | No, 2 × 7 × 19 |
| 267 | No, 3 × 89 |
| 268 | No, 2 × 2 × 67 |
| 269 | Yes |
Another number? Use the prime number checker for any value, or see the list of prime numbers.