No, 84 is not a prime number. It is a composite number: it is even, so it is divisible by 2.
84 has divisors other than 1 and itself. The smallest is 2: 84 ÷ 2 = 42.
Prime factorization: 84 = 2 × 2 × 3 × 7 = 2² × 3 × 7.
| Number | Prime? |
|---|---|
| 80 | No, 2 × 2 × 2 × 2 × 5 |
| 81 | No, 3 × 3 × 3 × 3 |
| 82 | No, 2 × 41 |
| 83 | Yes |
| 85 | No, 5 × 17 |
| 86 | No, 2 × 43 |
| 87 | No, 3 × 29 |
| 88 | No, 2 × 2 × 2 × 11 |
More about 84: factors of 84 · 84 squared · square root of 84 · 84 in binary · 84 in Roman numerals.
Another number? Use the prime number checker for any value, or see the list of prime numbers.