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    Is 729 a prime number?

    Prime Number Checker
    Number

    Is 729 a prime or composite number?

    Answer

    Number 729 is not a Prime

    729 = 3⁶

    729 has 7 divisors — 1, 3, 9, 27, 81, 243 and 729; a prime has exactly two: 1 and itself. It is a perfect square.

    Primes up to √729

    27² = 729 ≤ 729 < 784 = 28², so it is enough to try primes up to 27

    • ÷2 does not divide
    • ÷3 divides

    729 ÷ 3 = 243 — 3 divides 729, so 729 is composite

    Nearest primes: 727 and 733

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    Is 729 a prime number? Is 729 a prime number? 729 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
    699No: 3 × 233
    701Yes
    702No: 2 × 3³ × 13
    703No: 19 × 37
    705No: 3 × 5 × 47
    707No: 7 × 101
    709Yes
    711No: 3² × 79
    713No: 23 × 31
    716No: 2² × 179
    719Yes
    721No: 7 × 103
    723No: 3 × 241
    724No: 2² × 181
    727Yes
    729No: 3⁶
    731No: 17 × 43
    732No: 2² × 3 × 61
    733Yes
    736No: 2⁵ × 23
    737No: 11 × 67
    738No: 2 × 3² × 41
    739Yes
    741No: 3 × 13 × 19
    742No: 2 × 7 × 53
    743Yes
    748No: 2² × 11 × 17
    750No: 2 × 3 × 5³
    751Yes
    753No: 3 × 251

    FAQ

    Is 729 a prime or composite number?

    Number 729 is not a Prime

    How many factors are in a number 729?

    7

    How to check if 729 is prime?

    Divide 729 by the primes in order: 27² = 729 ≤ 729 < 784 = 28², so it is enough to try primes up to 27. The first one that divides it is 3: 729 ÷ 3 = 243, so 729 is composite.

    See Also