How to make an checker for prime numbers

Question

I know how but ineed your help to make the negative number to be not a prime number

Answer 1

boolean isPrime(int num) {
if (num < 0)
return false;
// Actual Logic
}

Answer 2

you mean the negative number to be recognized? well, if the number is less than zero then it is definately negative. Hope that helps

Answer 3

can you show me how?