Is 987 a prime number?
No, 987 is not a prime number. It is divisible by 3: 987 = 3 × 329.
Is 987 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 √987 ≈ 31.42. If none of them divides 987, it is prime.
- 3
3 divides 987 exactly, so it is not prime. Its prime factorisation is
LaTeX source of the formulas on this page
\[ 987 = 3 \times 7 \times 47 \]
Testing 987 by the primes up to its square root
| Prime | Division | Result |
|---|---|---|
| 2 | 987 ÷ 2 | leaves 1 |
| 3 | 987 ÷ 3 | divides exactly (329) |
| 5 | 987 ÷ 5 | leaves 2 |
| 7 | 987 ÷ 7 | divides exactly (141) |
| 11 | 987 ÷ 11 | leaves 8 |
| 13 | 987 ÷ 13 | leaves 12 |
| 17 | 987 ÷ 17 | leaves 1 |
| 19 | 987 ÷ 19 | leaves 18 |
| 23 | 987 ÷ 23 | leaves 21 |
| 29 | 987 ÷ 29 | leaves 1 |
| 31 | 987 ÷ 31 | leaves 26 |
Questions
Is 987 a prime number?
No, 987 is not a prime number. It is divisible by 3: 987 = 3 × 329.
What is the next prime after 987?
991.
What is the prime number before 987?
983.
What are the factors of 987?
1, 3, 7, 21, 47, 141, 329, 987.