Is 3990 a prime number?
No, 3990 is not a prime number. It is divisible by 2: 3990 = 2 × 1995.
Is 3990 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 √3990 ≈ 63.17. If none of them divides 3990, it is prime.
- 3
2 divides 3990 exactly, so it is not prime. Its prime factorisation is
LaTeX source of the formulas on this page
\[ 3990 = 2 \times 3 \times 5 \times 7 \times 19 \]
Testing 3990 by the primes up to its square root
| Prime | Division | Result |
|---|---|---|
| 2 | 3990 ÷ 2 | divides exactly (1995) |
| 3 | 3990 ÷ 3 | divides exactly (1330) |
| 5 | 3990 ÷ 5 | divides exactly (798) |
| 7 | 3990 ÷ 7 | divides exactly (570) |
| 11 | 3990 ÷ 11 | leaves 8 |
| 13 | 3990 ÷ 13 | leaves 12 |
| 17 | 3990 ÷ 17 | leaves 12 |
| 19 | 3990 ÷ 19 | divides exactly (210) |
| 23 | 3990 ÷ 23 | leaves 11 |
| 29 | 3990 ÷ 29 | leaves 17 |
| 31 | 3990 ÷ 31 | leaves 22 |
| 37 | 3990 ÷ 37 | leaves 31 |
Questions
Is 3990 a prime number?
No, 3990 is not a prime number. It is divisible by 2: 3990 = 2 × 1995.
What is the next prime after 3990?
4001.
What is the prime number before 3990?
3989.
What are the factors of 3990?
1, 2, 3, 5, 6, 7, 10, 14, 15, 19, 21, 30, 35, 38, 42, 57, 70, 95, 105, 114, 133, 190, 210, 266, 285, 399, 570, 665, 798, 1330, 1995, 3990.