program to know if a number is prime
#include<bits/stdc++.h>
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;
cin>>x;
if(Is_Prime(x))cout<<"Is Prime";
else cout<<"Is not Prime";
}C++ prime number check
// 6k+-1 optimisation
bool is_prime6(int num) {
int i;
if (num == 1)
return false;
if (num <= 3)
return true;
if (num % 2 == 0 || num % 3 == 0)
return false;
if (num < 25)
return true;
for (i = 5; i * i <= num; i += 6)
if (num % i == 0 || num % (i + 2) == 0)
return false;
return true;
}Copyright © 2021 Codeinu
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