Is 23 a prime number?
Yes, 23 is a prime number. Its only factors are 1 and 23.
Is 23 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 √23 ≈ 4.80. If none of them divides 23, it is prime.
- 3
None of them divides 23, so it is prime.
Testing 23 by the primes up to its square root
| Prime | Division | Result |
|---|---|---|
| 2 | 23 ÷ 2 | leaves 1 |
| 3 | 23 ÷ 3 | leaves 2 |
Questions
Is 23 a prime number?
Yes, 23 is a prime number. Its only factors are 1 and 23.
What is the next prime after 23?
29.
What is the prime number before 23?
19.
What are the factors of 23?
1, 23.