C++ prime number checker

#include《iostream》

using namespace std;

int main()
{
	bool quit = false ;
	
	do
	{
	int enteredNum = 0;
	cout << " " << endl ; 
	cout<< "Single number Prime Number Checker"<<endl;
	cout<<"Enter any integer.... key any alphabet to quit. "<< endl;
	cin >> enteredNum;
	
	if ( cin.fail( ))
	{
		quit = true;
	}
	

	if (enteredNum == 1 )
	{
		cout << "1 is not a prime number." << endl;	
	}
	else if ( enteredNum == 2)
	{
		cout << "2 is a prime number" << endl ; 
	}
	
	
	
	for ( int i = enteredNum -1 ; i >= 2 ; i-- )
	{
		if ( (enteredNum % i ==0)  && (enteredNum != 1 || 2))
		{
			cout << enteredNum << " is not a prime number." << endl; 	
			break;	
		}
		else if ( i == 2)
		{
			cout << enteredNum << " is a prime number." << endl ; 
		}
	}

	} // do...while bracket
	while (quit == false );
	
	
	
return 0;
}