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    Is 77 a prime number?

    Prime Number Checker
    Number

    Is 77 a prime or composite number?

    Answer

    Number 77 is not a Prime

    77 = 7 × 11

    77 has 4 divisors — 1, 7, 11 and 77; a prime has exactly two: 1 and itself.

    Primes up to √77

    8² = 64 ≤ 77 < 81 = 9², so it is enough to try primes up to 8

    • ÷2 does not divide
    • ÷3 does not divide
    • ÷5 does not divide
    • ÷7 divides

    77 ÷ 7 = 11 — 7 divides 77, so 77 is composite

    Nearest primes: 73 and 79

    Related Calculations

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    Is 77 a prime number? Is 77 a prime number? 77 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
    62No: 2 × 31
    63No: 3² × 7
    64No: 2⁶
    65No: 5 × 13
    66No: 2 × 3 × 11
    67Yes
    68No: 2² × 17
    69No: 3 × 23
    70No: 2 × 5 × 7
    71Yes
    72No: 2³ × 3²
    73Yes
    74No: 2 × 37
    75No: 3 × 5²
    76No: 2² × 19
    77No: 7 × 11
    78No: 2 × 3 × 13
    79Yes
    80No: 2⁴ × 5
    81No: 3⁴
    82No: 2 × 41
    83Yes
    84No: 2² × 3 × 7
    85No: 5 × 17
    86No: 2 × 43
    87No: 3 × 29
    88No: 2³ × 11
    89Yes
    90No: 2 × 3² × 5
    91No: 7 × 13

    FAQ

    Is 77 a prime or composite number?

    Number 77 is not a Prime

    How many factors are in a number 77?

    4

    How to check if 77 is prime?

    Divide 77 by the primes in order: 8² = 64 ≤ 77 < 81 = 9², so it is enough to try primes up to 8. The first one that divides it is 7: 77 ÷ 7 = 11, so 77 is composite.

    See Also