What is the problem in this code?..this is a" is prime" code

1 
#include <iostream>

using namespace std;

int main() 
{
	int N=7;
	cin>>N;
	if(N%1==0)
	{
		cout<<"yes"<<endl;
	}
	else{
		cout<<"no"<<endl;
	}
	
	return 0;
}
2

Can you please explain how you are determining if N is prime?