C++ Program to check whether a number is Prime or not
Program: #include<iostream> using namespace std; int main() { int n, a=2; bool r=false; cout<<"Enter a number="; cin>>n; for(int a=2; a<n; a++) { if(n%a==0) { r=true; } } if(r) { cout<<n<<" is not a prime number."; } else { if(n!=0&&n!=1) { cout<<n<<" is a prime number."; } else { cout<<"It is not a prime Number."; } } return 0; } Output: