No, 57 is not a prime number. It is a composite number: its digits add up to 12, which is divisible by 3, so 57 is divisible by 3.
57 has divisors other than 1 and itself. The smallest is 3: 57 ÷ 3 = 19.
Prime factorization: 57 = 3 × 19.
| Number | Prime? |
|---|---|
| 53 | Yes |
| 54 | No, 2 × 3 × 3 × 3 |
| 55 | No, 5 × 11 |
| 56 | No, 2 × 2 × 2 × 7 |
| 58 | No, 2 × 29 |
| 59 | Yes |
| 60 | No, 2 × 2 × 3 × 5 |
| 61 | Yes |
More about 57: factors of 57 · 57 squared · square root of 57 · 57 in binary · 57 in Roman numerals.
Another number? Use the prime number checker for any value, or see the list of prime numbers.