No, 178 is not a prime number. It is a composite number: it is even, so it is divisible by 2.
178 has divisors other than 1 and itself. The smallest is 2: 178 ÷ 2 = 89.
Prime factorization: 178 = 2 × 89.
| Number | Prime? |
|---|---|
| 174 | No, 2 × 3 × 29 |
| 175 | No, 5 × 5 × 7 |
| 176 | No, 2 × 2 × 2 × 2 × 11 |
| 177 | No, 3 × 59 |
| 179 | Yes |
| 180 | No, 2 × 2 × 3 × 3 × 5 |
| 181 | Yes |
| 182 | No, 2 × 7 × 13 |
More about 178: factors of 178 · square root of 178 · 178 in binary.
Another number? Use the prime number checker for any value, or see the list of prime numbers.