No, 63 is not a prime number. It is a composite number: its digits add up to 9, which is divisible by 3, so 63 is divisible by 3.
63 has divisors other than 1 and itself. The smallest is 3: 63 ÷ 3 = 21.
Prime factorization: 63 = 3 × 3 × 7 = 3² × 7.
| Number | Prime? |
|---|---|
| 59 | Yes |
| 60 | No, 2 × 2 × 3 × 5 |
| 61 | Yes |
| 62 | No, 2 × 31 |
| 64 | No, 2 × 2 × 2 × 2 × 2 × 2 |
| 65 | No, 5 × 13 |
| 66 | No, 2 × 3 × 11 |
| 67 | Yes |
More about 63: factors of 63 · 63 squared · square root of 63 · 63 in binary · 63 in Roman numerals.
Another number? Use the prime number checker for any value, or see the list of prime numbers.