No, 165 is not a prime number. It is a composite number: it ends in 5, so it is divisible by 5.
165 has divisors other than 1 and itself. The smallest is 3: 165 ÷ 3 = 55.
Prime factorization: 165 = 3 × 5 × 11.
| Number | Prime? |
|---|---|
| 161 | No, 7 × 23 |
| 162 | No, 2 × 3 × 3 × 3 × 3 |
| 163 | Yes |
| 164 | No, 2 × 2 × 41 |
| 166 | No, 2 × 83 |
| 167 | Yes |
| 168 | No, 2 × 2 × 2 × 3 × 7 |
| 169 | No, 13 × 13 |
More about 165: factors of 165 · square root of 165 · 165 in binary.
Another number? Use the prime number checker for any value, or see the list of prime numbers.