Is 80 a prime number?
No, 80 is not a prime number. It is divisible by 2: 80 = 2 × 40.
Is 80 prime?
Pick any whole number from 1 to 10,000.
How to work it out
- 1
A prime number has exactly two factors: 1 and itself.
- 2
It is enough to test the primes up to √80 ≈ 8.94. If none of them divides 80, it is prime.
- 3
2 divides 80 exactly, so it is not prime. Its prime factorisation is
LaTeX source of the formulas on this page
\[ 80 = 2^{4} \times 5 \]Testing 80 by the primes up to its square root
| Prime | Division | Result |
|---|---|---|
| 2 | 80 ÷ 2 | divides exactly (40) |
| 3 | 80 ÷ 3 | leaves 2 |
| 5 | 80 ÷ 5 | divides exactly (16) |
| 7 | 80 ÷ 7 | leaves 3 |
Questions
Is 80 a prime number?
No, 80 is not a prime number. It is divisible by 2: 80 = 2 × 40.
What is the next prime after 80?
83.
What is the prime number before 80?
79.
What are the factors of 80?
1, 2, 4, 5, 8, 10, 16, 20, 40, 80.