No, 170 is not a prime number. It is a composite number: it is even, so it is divisible by 2.
170 has divisors other than 1 and itself. The smallest is 2: 170 ÷ 2 = 85.
Prime factorization: 170 = 2 × 5 × 17.
| Number | Prime? |
|---|---|
| 166 | No, 2 × 83 |
| 167 | Yes |
| 168 | No, 2 × 2 × 2 × 3 × 7 |
| 169 | No, 13 × 13 |
| 171 | No, 3 × 3 × 19 |
| 172 | No, 2 × 2 × 43 |
| 173 | Yes |
| 174 | No, 2 × 3 × 29 |
More about 170: factors of 170 · square root of 170 · 170 in binary.
Another number? Use the prime number checker for any value, or see the list of prime numbers.