Is 43 a prime number?

Prime Number Checker
Number

Is 43 a prime or composite number?

Answer

Number 43 is a Prime

43 has exactly two divisors — 1 and 43 — so it is a prime.

Primes up to √43

6² = 36 ≤ 43 < 49 = 7², so it is enough to try primes up to 6

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

none of the 3 primes up to 6 divides 43 — 43 is prime

Nearest primes: 41 and 47

Related Calculations

See Also

Prime numbers list

NumberIs Prime
28No: 2² × 7
29Yes
30No: 2 × 3 × 5
31Yes
32No: 2⁵
33No: 3 × 11
34No: 2 × 17
35No: 5 × 7
36No: 2² × 3²
37Yes
38No: 2 × 19
39No: 3 × 13
40No: 2³ × 5
41Yes
42No: 2 × 3 × 7
43Yes
44No: 2² × 11
45No: 3² × 5
46No: 2 × 23
47Yes
48No: 2⁴ × 3
49No: 7²
50No: 2 × 5²
51No: 3 × 17
52No: 2² × 13
53Yes
54No: 2 × 3³
55No: 5 × 11
56No: 2³ × 7
57No: 3 × 19

FAQ

Is 43 a prime or composite number?

Number 43 is a Prime

How many factors are in a number 43?

2

How to check if 43 is prime?

Divide 43 by the primes in order: 6² = 36 ≤ 43 < 49 = 7², so it is enough to try primes up to 6. None of the 3 primes up to 6 divides 43, so 43 is prime.

See Also