Is 27 a prime number?

Prime Number Checker
Number

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

Related Calculations

See Also

Prime numbers list

NumberIs Prime
12No: 2² × 3
13Yes
14No: 2 × 7
15No: 3 × 5
16No: 2⁴
17Yes
18No: 2 × 3²
19Yes
20No: 2² × 5
21No: 3 × 7
22No: 2 × 11
23Yes
24No: 2³ × 3
25No: 5²
26No: 2 × 13
27No: 3³
28No: 2² × 7
29Yes
30No: 2 × 3 × 5
31Yes
32No: 2⁵
33No: 3 × 11
34No: 2 × 17
35No: 5 × 7
36No: 2² × 3²
37Yes
38No: 2 × 19
39No: 3 × 13
40No: 2³ × 5
41Yes

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.

See Also