No, 420 is not a prime number. It is a composite number: it is even, so it is divisible by 2.
420 has divisors other than 1 and itself. The smallest is 2: 420 ÷ 2 = 210.
Prime factorization: 420 = 2 × 2 × 3 × 5 × 7 = 2² × 3 × 5 × 7.
| Number | Prime? |
|---|---|
| 416 | No, 2 × 2 × 2 × 2 × 2 × 13 |
| 417 | No, 3 × 139 |
| 418 | No, 2 × 11 × 19 |
| 419 | Yes |
| 421 | Yes |
| 422 | No, 2 × 211 |
| 423 | No, 3 × 3 × 47 |
| 424 | No, 2 × 2 × 2 × 53 |
Another number? Use the prime number checker for any value, or see the list of prime numbers.