Is 9 a prime number?
No, 9 is not a prime number. It is divisible by 3: 9 = 3 × 3.
Is 9 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 √9 ≈ 3.00. If none of them divides 9, it is prime.
- 3
3 divides 9 exactly, so it is not prime. Its prime factorisation is
LaTeX source of the formulas on this page
\[ 9 = 3^{2} \]Testing 9 by the primes up to its square root
| Prime | Division | Result |
|---|---|---|
| 2 | 9 ÷ 2 | leaves 1 |
| 3 | 9 ÷ 3 | divides exactly (3) |
Questions
Is 9 a prime number?
No, 9 is not a prime number. It is divisible by 3: 9 = 3 × 3.
What is the next prime after 9?
11.
What is the prime number before 9?
7.
What are the factors of 9?
1, 3, 9.