Usage for hash tag: primenumber

...} else { cout << n << " is not a prime number."; } return 0; } ``` **Reference:** * [C++ Primer](https://www.amazon.com/C-Primer-5th-Stanley-B-Lippman/dp/0321714113) * [C++ Programming Tutorial](https://www.learncpp.com/) **Hashtags:** * #C++ * #primenumber * #check * #Programming