No, 42 is not a prime number. It is a composite number: it is even, so it is divisible by 2.
42 has divisors other than 1 and itself. The smallest is 2: 42 ÷ 2 = 21.
Prime factorization: 42 = 2 × 3 × 7.
| Number | Prime? |
|---|---|
| 38 | No, 2 × 19 |
| 39 | No, 3 × 13 |
| 40 | No, 2 × 2 × 2 × 5 |
| 41 | Yes |
| 43 | Yes |
| 44 | No, 2 × 2 × 11 |
| 45 | No, 3 × 3 × 5 |
| 46 | No, 2 × 23 |
More about 42: factors of 42 · 42 squared · square root of 42 · 42 in binary · 42 in Roman numerals.
Another number? Use the prime number checker for any value, or see the list of prime numbers.