No, 153 is not a prime number. It is a composite number: its digits add up to 9, which is divisible by 3, so 153 is divisible by 3.
153 has divisors other than 1 and itself. The smallest is 3: 153 ÷ 3 = 51.
Prime factorization: 153 = 3 × 3 × 17 = 3² × 17.
| Number | Prime? |
|---|---|
| 149 | Yes |
| 150 | No, 2 × 3 × 5 × 5 |
| 151 | Yes |
| 152 | No, 2 × 2 × 2 × 19 |
| 154 | No, 2 × 7 × 11 |
| 155 | No, 5 × 31 |
| 156 | No, 2 × 2 × 3 × 13 |
| 157 | Yes |
More about 153: factors of 153 · square root of 153 · 153 in binary.
Another number? Use the prime number checker for any value, or see the list of prime numbers.