Check out example codes for "program to know if a number is prime". It will help you in understanding the concepts better.

Code Example 1

using namespace std;
bool Is_Prime(long long x){
	if(x%2==0)return false;
	for(int i=3;i*i<=x;i+=2)
		if(x%i==0)return false;
	return true;
int main(){
	long long x;
	if(Is_Prime(x))cout<<"Is Prime";
	else cout<<"Is not Prime";

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