Prime Numbers

This Program will tell you whether number is prime or not...

#include <iostream>

using namespace std;

int main(){

int x, y, sum;

cout << "Enter the desired numbrer ";

cin >>x;

sum = 0;

y = x / 2;

for (int i = 1; i <= y; i++)

{

sum = sum + i;

}

if (sum > 1)

cout << "The number is not prime"<<endl;

else

cout << "The number is prime"<<endl;

return 0;

}