No, 80 is not a prime number. It is a composite number: it is even, so it is divisible by 2.
80 has divisors other than 1 and itself. The smallest is 2: 80 ÷ 2 = 40.
Prime factorization: 80 = 2 × 2 × 2 × 2 × 5 = 2⁴ × 5.
| Number | Prime? |
|---|---|
| 76 | No, 2 × 2 × 19 |
| 77 | No, 7 × 11 |
| 78 | No, 2 × 3 × 13 |
| 79 | Yes |
| 81 | No, 3 × 3 × 3 × 3 |
| 82 | No, 2 × 41 |
| 83 | Yes |
| 84 | No, 2 × 2 × 3 × 7 |
More about 80: factors of 80 · 80 squared · square root of 80 · 80 in binary · 80 in Roman numerals.
Another number? Use the prime number checker for any value, or see the list of prime numbers.