Is 43 a prime number?
Yes, 43 is a prime number. Its only factors are 1 and 43.
Is 43 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 √43 ≈ 6.56. If none of them divides 43, it is prime.
- 3
None of them divides 43, so it is prime.
Testing 43 by the primes up to its square root
| Prime | Division | Result |
|---|---|---|
| 2 | 43 ÷ 2 | leaves 1 |
| 3 | 43 ÷ 3 | leaves 1 |
| 5 | 43 ÷ 5 | leaves 3 |
Questions
Is 43 a prime number?
Yes, 43 is a prime number. Its only factors are 1 and 43.
What is the next prime after 43?
47.
What is the prime number before 43?
41.
What are the factors of 43?
1, 43.