C++ code for checking for prime numbers not working

Question

I\'m having trouble with this C++ code. The integer num is a number that I want to check if it is prime. However this program is always returning false. It\'s proba

Answer 1

bool isprime(int n)
{
    if(n<2) return false;
    if(n==2)return true;
    for(int i=2;i<=sqrt(n);i++)
        if(n%i==0) return false;
    return true;
}