Need a program in c++ of finding prime number using while loop and there should be no flag in the code

Question

prime number

Answer 1

Homework assignment? If so then, well, please attempt it yourself, and if you get stuck, feel free to post your question here. No effort won't get you very far. Cheers.

https://www.sololearn.com/discuss/1316935/?ref=app

Answer 2

what does "there should be no flag " mean in this context?