Is 357 a prime number?

Prime Number Checker
Number

Is 357 a prime or composite number?

Answer

Number 357 is not a Prime

357 = 3 × 7 × 17

357 has 8 divisors — 1, 3, 7, 17, 21, 51, 119 and 357; a prime has exactly two: 1 and itself.

Primes up to √357

18² = 324 ≤ 357 < 361 = 19², so it is enough to try primes up to 18

  • ÷2 does not divide
  • ÷3 divides

357 ÷ 3 = 119 — 3 divides 357, so 357 is composite

Nearest primes: 353 and 359

Related Calculations

See Also

Prime numbers list

NumberIs Prime
335No: 5 × 67
336No: 2⁴ × 3 × 7
337Yes
341No: 11 × 31
343No: 7³
344No: 2³ × 43
345No: 3 × 5 × 23
347Yes
348No: 2² × 3 × 29
349Yes
350No: 2 × 5² × 7
351No: 3³ × 13
353Yes
354No: 2 × 3 × 59
355No: 5 × 71
357No: 3 × 7 × 17
359Yes
361No: 19²
363No: 3 × 11²
364No: 2² × 7 × 13
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

FAQ

Is 357 a prime or composite number?

Number 357 is not a Prime

How many factors are in a number 357?

8

How to check if 357 is prime?

Divide 357 by the primes in order: 18² = 324 ≤ 357 < 361 = 19², so it is enough to try primes up to 18. The first one that divides it is 3: 357 ÷ 3 = 119, so 357 is composite.

See Also