No, 172 is not a prime number. It is a composite number: it is even, so it is divisible by 2.
172 has divisors other than 1 and itself. The smallest is 2: 172 ÷ 2 = 86.
Prime factorization: 172 = 2 × 2 × 43 = 2² × 43.
| Number | Prime? |
|---|---|
| 168 | No, 2 × 2 × 2 × 3 × 7 |
| 169 | No, 13 × 13 |
| 170 | No, 2 × 5 × 17 |
| 171 | No, 3 × 3 × 19 |
| 173 | Yes |
| 174 | No, 2 × 3 × 29 |
| 175 | No, 5 × 5 × 7 |
| 176 | No, 2 × 2 × 2 × 2 × 11 |
More about 172: factors of 172 · square root of 172 · 172 in binary.
Another number? Use the prime number checker for any value, or see the list of prime numbers.