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Is 4 a prime number?

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Is 4 a prime or composite number?

Answer

Number 4 is not a Prime

4 = 2²

4 has 3 divisors — 1, 2 and 4; a prime has exactly two: 1 and itself. It is a perfect square.

Primes up to √4

2² = 4 ≤ 4 < 9 = 3², so it is enough to try primes up to 2

÷2 divides

4 ÷ 2 = 2 — 2 divides 4, so 4 is composite

Nearest primes: 3 and 5

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See Also

Factors of a Number - List all Factors and Factor Pairs of a Number
Prime Factorization - Prime Factorization Calculator
Prime Numbers List - List of all Prime Numbers - how many Prime numbers are between

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Is 4 a prime number? Is 4 a prime number? 4 is a composite number. Check if any number is prime or composite with our free online prime checker.

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Prime numbers list

Number	Is Prime
1	No: neither prime nor composite
2	Yes
3	Yes
4	No: 2²
5	Yes
6	No: 2 × 3
7	Yes
8	No: 2³
9	No: 3²
10	No: 2 × 5
11	Yes
12	No: 2² × 3
13	Yes
14	No: 2 × 7
15	No: 3 × 5
16	No: 2⁴
17	Yes
18	No: 2 × 3²
19	Yes
20	No: 2² × 5
21	No: 3 × 7
22	No: 2 × 11
23	Yes
24	No: 2³ × 3
25	No: 5²
26	No: 2 × 13
27	No: 3³
28	No: 2² × 7
29	Yes
30	No: 2 × 3 × 5

FAQ

Is 4 a prime or composite number?

Number 4 is not a Prime

How many factors are in a number 4?

3

How to check if 4 is prime?

Divide 4 by the primes in order: 2² = 4 ≤ 4 < 9 = 3², so it is enough to try primes up to 2. The first one that divides it is 2: 4 ÷ 2 = 2, so 4 is composite.

See Also