No, 158 is not a prime number. It is a composite number: it is even, so it is divisible by 2.
158 has divisors other than 1 and itself. The smallest is 2: 158 ÷ 2 = 79.
Prime factorization: 158 = 2 × 79.
| Number | Prime? |
|---|---|
| 154 | No, 2 × 7 × 11 |
| 155 | No, 5 × 31 |
| 156 | No, 2 × 2 × 3 × 13 |
| 157 | Yes |
| 159 | No, 3 × 53 |
| 160 | No, 2 × 2 × 2 × 2 × 2 × 5 |
| 161 | No, 7 × 23 |
| 162 | No, 2 × 3 × 3 × 3 × 3 |
More about 158: factors of 158 · square root of 158 · 158 in binary.
Another number? Use the prime number checker for any value, or see the list of prime numbers.