Is 8 a prime number?
No, 8 is not a prime number. It is divisible by 2: 8 = 2 × 4.
Is 8 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 √8 ≈ 2.83. If none of them divides 8, it is prime.
- 3
2 divides 8 exactly, so it is not prime. Its prime factorisation is
LaTeX source of the formulas on this page
\[ 8 = 2^{3} \]Testing 8 by the primes up to its square root
| Prime | Division | Result |
|---|---|---|
| 2 | 8 ÷ 2 | divides exactly (4) |
Questions
Is 8 a prime number?
No, 8 is not a prime number. It is divisible by 2: 8 = 2 × 4.
What is the next prime after 8?
11.
What is the prime number before 8?
7.
What are the factors of 8?
1, 2, 4, 8.