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check prime cpp gfg Code Example
check prime cpp gfg 
bool isPrime(int s){
   if(s <= 1) return false;
   if(s == 2) return true;
   for(int i = 2; i * i <= s; i++) {
       if(s % i== 0) return false;
   }
   return true;
}
fast way to check if a number is prime C++ 
//O(sqrt(n))
bool isPrime(int num){
    if(num <= 1) return false;
    for(int i = 2; i <= sqrt(num); i++){
          if(num % i == 0) return false;
    }
    return true;
}
Source: stackoverflow.com



Cpp

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