Is 11 a prime number?
Yes, 11 is a prime number. Its only factors are 1 and 11.
Is 11 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 √11 ≈ 3.32. If none of them divides 11, it is prime.
- 3
None of them divides 11, so it is prime.
Testing 11 by the primes up to its square root
| Prime | Division | Result |
|---|---|---|
| 2 | 11 ÷ 2 | leaves 1 |
| 3 | 11 ÷ 3 | leaves 2 |
Questions
Is 11 a prime number?
Yes, 11 is a prime number. Its only factors are 1 and 11.
What is the next prime after 11?
13.
What is the prime number before 11?
7.
What are the factors of 11?
1, 11.