Is 671 a prime number?

Prime Number Checker
Number

Is 671 a prime or composite number?

Answer

Number 671 is not a Prime

671 = 11 × 61

671 has 4 divisors — 1, 11, 61 and 671; a prime has exactly two: 1 and itself.

Primes up to √671

25² = 625 ≤ 671 < 676 = 26², so it is enough to try primes up to 25

  • ÷2 does not divide
  • ÷3 does not divide
  • ÷5 does not divide
  • ÷7 does not divide
  • ÷11 divides

671 ÷ 11 = 61 — 11 divides 671, so 671 is composite

Nearest primes: 661 and 673

Related Calculations

See Also

Prime numbers list

NumberIs Prime
647Yes
649No: 11 × 59
651No: 3 × 7 × 31
652No: 2² × 163
653Yes
659Yes
660No: 2² × 3 × 5 × 11
661Yes
662No: 2 × 331
663No: 3 × 13 × 17
665No: 5 × 7 × 19
666No: 2 × 3² × 37
667No: 23 × 29
668No: 2² × 167
669No: 3 × 223
671No: 11 × 61
672No: 2⁵ × 3 × 7
673Yes
674No: 2 × 337
675No: 3³ × 5²
677Yes
678No: 2 × 3 × 113
679No: 7 × 97
681No: 3 × 227
683Yes
684No: 2² × 3² × 19
689No: 13 × 53
690No: 2 × 3 × 5 × 23
691Yes
693No: 3² × 7 × 11

FAQ

Is 671 a prime or composite number?

Number 671 is not a Prime

How many factors are in a number 671?

4

How to check if 671 is prime?

Divide 671 by the primes in order: 25² = 625 ≤ 671 < 676 = 26², so it is enough to try primes up to 25. The first one that divides it is 11: 671 ÷ 11 = 61, so 671 is composite.

See Also