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    Is 231 a prime number?

    Prime Number Checker
    Number

    Is 231 a prime or composite number?

    Answer

    Number 231 is not a Prime

    231 = 3 × 7 × 11

    231 has 8 divisors — 1, 3, 7, 11, 21, 33, 77 and 231; a prime has exactly two: 1 and itself.

    Primes up to √231

    15² = 225 ≤ 231 < 256 = 16², so it is enough to try primes up to 15

    • ÷2 does not divide
    • ÷3 divides

    231 ÷ 3 = 77 — 3 divides 231, so 231 is composite

    Nearest primes: 229 and 233

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    Is 231 a prime number? Is 231 a prime number? 231 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

    NumberIs Prime
    211Yes
    213No: 3 × 71
    214No: 2 × 107
    215No: 5 × 43
    216No: 2³ × 3³
    217No: 7 × 31
    219No: 3 × 73
    220No: 2² × 5 × 11
    221No: 13 × 17
    222No: 2 × 3 × 37
    223Yes
    225No: 3² × 5²
    226No: 2 × 113
    227Yes
    229Yes
    231No: 3 × 7 × 11
    232No: 2³ × 29
    233Yes
    234No: 2 × 3² × 13
    235No: 5 × 47
    237No: 3 × 79
    238No: 2 × 7 × 17
    239Yes
    240No: 2⁴ × 3 × 5
    241Yes
    243No: 3⁵
    246No: 2 × 3 × 41
    247No: 13 × 19
    249No: 3 × 83
    250No: 2 × 5³

    FAQ

    Is 231 a prime or composite number?

    Number 231 is not a Prime

    How many factors are in a number 231?

    8

    How to check if 231 is prime?

    Divide 231 by the primes in order: 15² = 225 ≤ 231 < 256 = 16², so it is enough to try primes up to 15. The first one that divides it is 3: 231 ÷ 3 = 77, so 231 is composite.

    See Also