Is 77 a Prime Number?
Is 77 prime?
No
77 = 7 × 11 (divisible by 7).
Why
77 is composite because it is divisible by 7 (77 = 7 × 11), so it has factors other than 1 and itself.
A prime number is a whole number greater than 1 whose only factors are 1 and itself. To check 77, test whether any prime up to √77 divides it evenly — if none do, it is prime.
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The prime factorization calculator tests any number and shows its prime factors and all divisors.
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Frequently asked questions
Is 77 a prime number?+
No, 77 is composite because it is divisible by 7 (77 = 7 × 11), so it has factors other than 1 and itself.
What is 77 divisible by?+
77 is divisible by more than just 1 and itself. Its prime factorization is 77 = 7 × 11.