No, 189 is not a prime number. It is a composite number: its digits add up to 18, which is divisible by 3, so 189 is divisible by 3.
189 has divisors other than 1 and itself. The smallest is 3: 189 ÷ 3 = 63.
Prime factorization: 189 = 3 × 3 × 3 × 7 = 3³ × 7.
| Number | Prime? |
|---|---|
| 185 | No, 5 × 37 |
| 186 | No, 2 × 3 × 31 |
| 187 | No, 11 × 17 |
| 188 | No, 2 × 2 × 47 |
| 190 | No, 2 × 5 × 19 |
| 191 | Yes |
| 192 | No, 2 × 2 × 2 × 2 × 2 × 2 × 3 |
| 193 | Yes |
More about 189: factors of 189 · square root of 189 · 189 in binary.
Another number? Use the prime number checker for any value, or see the list of prime numbers.