Is 989 a prime number?
No, 989 is not a prime number. It is divisible by 23: 989 = 23 × 43.
Is 989 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 √989 ≈ 31.45. If none of them divides 989, it is prime.
- 3
23 divides 989 exactly, so it is not prime. Its prime factorisation is
LaTeX source of the formulas on this page
\[ 989 = 23 \times 43 \]
Testing 989 by the primes up to its square root
| Prime | Division | Result |
|---|---|---|
| 2 | 989 ÷ 2 | leaves 1 |
| 3 | 989 ÷ 3 | leaves 2 |
| 5 | 989 ÷ 5 | leaves 4 |
| 7 | 989 ÷ 7 | leaves 2 |
| 11 | 989 ÷ 11 | leaves 10 |
| 13 | 989 ÷ 13 | leaves 1 |
| 17 | 989 ÷ 17 | leaves 3 |
| 19 | 989 ÷ 19 | leaves 1 |
| 23 | 989 ÷ 23 | divides exactly (43) |
| 29 | 989 ÷ 29 | leaves 3 |
| 31 | 989 ÷ 31 | leaves 28 |
Questions
Is 989 a prime number?
No, 989 is not a prime number. It is divisible by 23: 989 = 23 × 43.
What is the next prime after 989?
991.
What is the prime number before 989?
983.
What are the factors of 989?
1, 23, 43, 989.