No, 161 is not a prime number. It is a composite number: 161 = 7 × 23.
161 has divisors other than 1 and itself. The smallest is 7: 161 ÷ 7 = 23.
Prime factorization: 161 = 7 × 23.
| Number | Prime? |
|---|---|
| 157 | Yes |
| 158 | No, 2 × 79 |
| 159 | No, 3 × 53 |
| 160 | No, 2 × 2 × 2 × 2 × 2 × 5 |
| 162 | No, 2 × 3 × 3 × 3 × 3 |
| 163 | Yes |
| 164 | No, 2 × 2 × 41 |
| 165 | No, 3 × 5 × 11 |
More about 161: factors of 161 · square root of 161 · 161 in binary.
Another number? Use the prime number checker for any value, or see the list of prime numbers.