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    Is 321 a prime number?

    Prime Number Checker
    Number

    Is 321 a prime or composite number?

    Answer

    Number 321 is not a Prime

    321 = 3 × 107

    321 has 4 divisors — 1, 3, 107 and 321; a prime has exactly two: 1 and itself.

    Primes up to √321

    17² = 289 ≤ 321 < 324 = 18², so it is enough to try primes up to 17

    • ÷2 does not divide
    • ÷3 divides

    321 ÷ 3 = 107 — 3 divides 321, so 321 is composite

    Nearest primes: 317 and 331

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    Is 321 a prime number? Is 321 a prime number? 321 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
    302No: 2 × 151
    303No: 3 × 101
    304No: 2⁴ × 19
    305No: 5 × 61
    306No: 2 × 3² × 17
    307Yes
    309No: 3 × 103
    310No: 2 × 5 × 31
    311Yes
    312No: 2³ × 3 × 13
    313Yes
    315No: 3² × 5 × 7
    317Yes
    318No: 2 × 3 × 53
    319No: 11 × 29
    321No: 3 × 107
    322No: 2 × 7 × 23
    323No: 17 × 19
    324No: 2² × 3⁴
    326No: 2 × 163
    329No: 7 × 47
    331Yes
    332No: 2² × 83
    333No: 3² × 37
    334No: 2 × 167
    335No: 5 × 67
    336No: 2⁴ × 3 × 7
    337Yes
    341No: 11 × 31
    343No: 7³

    FAQ

    Is 321 a prime or composite number?

    Number 321 is not a Prime

    How many factors are in a number 321?

    4

    How to check if 321 is prime?

    Divide 321 by the primes in order: 17² = 289 ≤ 321 < 324 = 18², so it is enough to try primes up to 17. The first one that divides it is 3: 321 ÷ 3 = 107, so 321 is composite.

    See Also