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Is 42 a prime number?

Prime Number Checker

Is 42 a prime or composite number?

Answer

Number 42 is not a Prime

42 = 2 × 3 × 7

42 has 8 divisors — 1, 2, 3, 6, 7, 14, 21 and 42; a prime has exactly two: 1 and itself.

Primes up to √42

6² = 36 ≤ 42 < 49 = 7², so it is enough to try primes up to 6

÷2 divides

42 ÷ 2 = 21 — 2 divides 42, so 42 is composite

Nearest primes: 41 and 43

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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 42 a prime number? Is 42 a prime number? 42 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
27	No: 3³
28	No: 2² × 7
29	Yes
30	No: 2 × 3 × 5
31	Yes
32	No: 2⁵
33	No: 3 × 11
34	No: 2 × 17
35	No: 5 × 7
36	No: 2² × 3²
37	Yes
38	No: 2 × 19
39	No: 3 × 13
40	No: 2³ × 5
41	Yes
42	No: 2 × 3 × 7
43	Yes
44	No: 2² × 11
45	No: 3² × 5
46	No: 2 × 23
47	Yes
48	No: 2⁴ × 3
49	No: 7²
50	No: 2 × 5²
51	No: 3 × 17
52	No: 2² × 13
53	Yes
54	No: 2 × 3³
55	No: 5 × 11
56	No: 2³ × 7

FAQ

Is 42 a prime or composite number?

Number 42 is not a Prime

How many factors are in a number 42?

8

How to check if 42 is prime?

Divide 42 by the primes in order: 6² = 36 ≤ 42 < 49 = 7², so it is enough to try primes up to 6. The first one that divides it is 2: 42 ÷ 2 = 21, so 42 is composite.