Is 387 a prime number?

Prime Number Checker
Number

Is 387 a prime or composite number?

Answer

Number 387 is not a Prime

387 = 3² × 43

387 has 6 divisors — 1, 3, 9, 43, 129 and 387; a prime has exactly two: 1 and itself.

Primes up to √387

19² = 361 ≤ 387 < 400 = 20², so it is enough to try primes up to 19

  • ÷2 does not divide
  • ÷3 divides

387 ÷ 3 = 129 — 3 divides 387, so 387 is composite

Nearest primes: 383 and 389

Related Calculations

See Also

Prime numbers list

NumberIs Prime
365No: 5 × 73
367Yes
369No: 3² × 41
370No: 2 × 5 × 37
371No: 7 × 53
372No: 2² × 3 × 31
373Yes
375No: 3 × 5³
376No: 2³ × 47
377No: 13 × 29
379Yes
381No: 3 × 127
383Yes
384No: 2⁷ × 3
385No: 5 × 7 × 11
387No: 3² × 43
388No: 2² × 97
389Yes
391No: 17 × 23
394No: 2 × 197
395No: 5 × 79
397Yes
398No: 2 × 199
400No: 2⁴ × 5²
401Yes
403No: 13 × 31
404No: 2² × 101
407No: 11 × 37
408No: 2³ × 3 × 17
409Yes

FAQ

Is 387 a prime or composite number?

Number 387 is not a Prime

How many factors are in a number 387?

6

How to check if 387 is prime?

Divide 387 by the primes in order: 19² = 361 ≤ 387 < 400 = 20², so it is enough to try primes up to 19. The first one that divides it is 3: 387 ÷ 3 = 129, so 387 is composite.

See Also