Question: 12 is prime number or not?
Answer: For 12, the answer is: No, 12 is not a prime number. The list of all positive divisors (i.e., the list of all integers that divide 12) is as follows: 1, 2, 3, 4, 6, 12. For 12 to be a prime number, it would have been required that 12 has only two divisors, i.e., itself and 1.