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Is 27 a prime number?

Prime Number Checker

Is 27 a prime or composite number?

Answer

Number 27 is not a Prime

27 = 3³

27 has 4 divisors — 1, 3, 9 and 27; a prime has exactly two: 1 and itself.

Primes up to √27

5² = 25 ≤ 27 < 36 = 6², so it is enough to try primes up to 5

÷2 does not divide
÷3 divides

27 ÷ 3 = 9 — 3 divides 27, so 27 is composite

Nearest primes: 23 and 29

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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 27 a prime number? Is 27 a prime number? 27 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
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
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

FAQ

Is 27 a prime or composite number?

Number 27 is not a Prime

How many factors are in a number 27?

4

How to check if 27 is prime?

Divide 27 by the primes in order: 5² = 25 ≤ 27 < 36 = 6², so it is enough to try primes up to 5. The first one that divides it is 3: 27 ÷ 3 = 9, so 27 is composite.