C++ do while not looping

I understand I can just use for-loop to define prime number, but before I implement for loop into that topic, I had a thought that I maybe could make one with while loop or do-while. Somehow, my do-while loop seems not to be working correctly.

My theory was that I could find prime number for checking the remainder of divisor where divisor keeps decreasing by 1 until divisor reaches 1. (Although 'until divisor reaches 1.' part is not in the code, I would assumed remainder of 0 would appear anyway before divisor goes below 0.)

However, it keeps halting before remainder reaches 0. What did I do wrong? I've even tried both instead of (remainder<1 && remainder!=1)below but still no luck.

 while (remainder<1)
 while (remainder==1)



 #include <iostream>
using namespace std;
int main()
{
    int number, divisor, remainder;
    cin >> number;
    divisor=number-1;
    cout << "You've put " << number << ".\n";
    do {
    divisor = divisor - 1;
    remainder=number%divisor;
    }
    while (remainder<1);
cout << divisor << "  "  << remainder << "  " << number << "  "  << "Divisor, remainder, number\n";
    return 0;
}