Is 4 a prime number?
No, 4 is not a prime number. It is divisible by 2: 4 = 2 × 2.
Is 4 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 √4 ≈ 2.00. If none of them divides 4, it is prime.
- 3
2 divides 4 exactly, so it is not prime. Its prime factorisation is
LaTeX source of the formulas on this page
\[ 4 = 2^{2} \]Testing 4 by the primes up to its square root
| Prime | Division | Result |
|---|---|---|
| 2 | 4 ÷ 2 | divides exactly (2) |
Questions
Is 4 a prime number?
No, 4 is not a prime number. It is divisible by 2: 4 = 2 × 2.
What is the next prime after 4?
5.
What is the prime number before 4?
3.
What are the factors of 4?
1, 2, 4.