Is 4 a Prime Number?
Is 4 prime?
No
4 = 2² (divisible by 2).
Why
4 is composite because it is divisible by 2 (4 = 2²), so it has factors other than 1 and itself.
A prime number is a whole number greater than 1 whose only factors are 1 and itself. To check 4, test whether any prime up to √4 divides it evenly — if none do, it is prime.
Check another number
The prime factorization calculator tests any number and shows its prime factors and all divisors.
Nearby numbers
Frequently asked questions
Is 4 a prime number?+
No, 4 is composite because it is divisible by 2 (4 = 2²), so it has factors other than 1 and itself.
What is 4 divisible by?+
4 is divisible by more than just 1 and itself. Its prime factorization is 4 = 2².