Is 990 a prime number?
No, 990 is not a prime number. It is divisible by 2: 990 = 2 × 495.
Is 990 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 √990 ≈ 31.46. If none of them divides 990, it is prime.
- 3
2 divides 990 exactly, so it is not prime. Its prime factorisation is
LaTeX source of the formulas on this page
\[ 990 = 2 \times 3^{2} \times 5 \times 11 \]Testing 990 by the primes up to its square root
| Prime | Division | Result |
|---|---|---|
| 2 | 990 ÷ 2 | divides exactly (495) |
| 3 | 990 ÷ 3 | divides exactly (330) |
| 5 | 990 ÷ 5 | divides exactly (198) |
| 7 | 990 ÷ 7 | leaves 3 |
| 11 | 990 ÷ 11 | divides exactly (90) |
| 13 | 990 ÷ 13 | leaves 2 |
| 17 | 990 ÷ 17 | leaves 4 |
| 19 | 990 ÷ 19 | leaves 2 |
| 23 | 990 ÷ 23 | leaves 1 |
| 29 | 990 ÷ 29 | leaves 4 |
| 31 | 990 ÷ 31 | leaves 29 |
Questions
Is 990 a prime number?
No, 990 is not a prime number. It is divisible by 2: 990 = 2 × 495.
What is the next prime after 990?
991.
What is the prime number before 990?
983.
What are the factors of 990?
1, 2, 3, 5, 6, 9, 10, 11, 15, 18, 22, 30, 33, 45, 55, 66, 90, 99, 110, 165, 198, 330, 495, 990.