Is 68 a Prime Number?

No, 68 is not a prime number, it is a composite number.

68 Not a Prime Number Proof with Adraktas Formula

X = 68

a5 = [ X - 5 ] / 6
a5 = [ 68 - 5 ] / 6
a5 = 10.5
a5 is not integer

a7 = [ X - 7 ] / 6
a7 = [ 68 - 7 ] / 6
a7 = 10.1666666667
a7 is not integer

Both a5 and a7 is not integer.

68 is not a prime number

Why 68 is not a prime number?

Because 68 has divisors rather than 1 and itself. 68 can be divided by 2 and 2.

Prime factorization of 68 (list of divisors):

  • 2
  • 2
  • 17

The next prime number of 68 is 71
The previous prime number of 68 is 67.


Related Prime Numbers

Biggest 10 prime numbers smaller than 68

Smallest 10 prime numbers bigger than 68

Related Non-Prime Numbers

Biggest 10 composite numbers smaller than 68

Smallest 10 composite numbers bigger than 68