Divided by itself and 1 without a remainder? All numbers are like that as far as I can tell. 4 divided by 4 is 1 and 4 divided by 1 is 4 so why isn’t 4 a prime number?
Primes are positive integers that are ONLY divisible by themselves and one. Four is also divisible by two, and so is not prime.
Because 4 can also be divided by 2.....