No, 27 is not a prime number. It is a composite number: its digits add up to 9, which is divisible by 3, so 27 is divisible by 3.
27 has divisors other than 1 and itself. The smallest is 3: 27 ÷ 3 = 9.
Prime factorization: 27 = 3 × 3 × 3 = 3³.
| Number | Prime? |
|---|---|
| 23 | Yes |
| 24 | No, 2 × 2 × 2 × 3 |
| 25 | No, 5 × 5 |
| 26 | No, 2 × 13 |
| 28 | No, 2 × 2 × 7 |
| 29 | Yes |
| 30 | No, 2 × 3 × 5 |
| 31 | Yes |
More about 27: factors of 27 · 27 squared · square root of 27 · 27 in binary · 27 in Roman numerals.
Another number? Use the prime number checker for any value, or see the list of prime numbers.