Is 13 a prime number?
Yes, 13 is a prime number. Its only factors are 1 and 13.
Is 13 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 √13 ≈ 3.61. If none of them divides 13, it is prime.
- 3
None of them divides 13, so it is prime.
Testing 13 by the primes up to its square root
| Prime | Division | Result |
|---|---|---|
| 2 | 13 ÷ 2 | leaves 1 |
| 3 | 13 ÷ 3 | leaves 1 |
Questions
Is 13 a prime number?
Yes, 13 is a prime number. Its only factors are 1 and 13.
What is the next prime after 13?
17.
What is the prime number before 13?
11.
What are the factors of 13?
1, 13.