Is 997 a prime number?
Yes, 997 is a prime number. Its only factors are 1 and 997.
Is 997 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 √997 ≈ 31.58. If none of them divides 997, it is prime.
- 3
None of them divides 997, so it is prime.
Testing 997 by the primes up to its square root
| Prime | Division | Result |
|---|---|---|
| 2 | 997 ÷ 2 | leaves 1 |
| 3 | 997 ÷ 3 | leaves 1 |
| 5 | 997 ÷ 5 | leaves 2 |
| 7 | 997 ÷ 7 | leaves 3 |
| 11 | 997 ÷ 11 | leaves 7 |
| 13 | 997 ÷ 13 | leaves 9 |
| 17 | 997 ÷ 17 | leaves 11 |
| 19 | 997 ÷ 19 | leaves 9 |
| 23 | 997 ÷ 23 | leaves 8 |
| 29 | 997 ÷ 29 | leaves 11 |
| 31 | 997 ÷ 31 | leaves 5 |
Questions
Is 997 a prime number?
Yes, 997 is a prime number. Its only factors are 1 and 997.
What is the next prime after 997?
1009.
What is the prime number before 997?
991.
What are the factors of 997?
1, 997.