&quot;Compilers &amp; drivers aren&#x27;t libraries&quot;? I&#x27;ve used LLVM as a library to just-in-time compile from Python. How is that not a library?<p>BTW, I&#x27;ve used primality testers I don&#x27;t understand and couldn&#x27;t implement on my own. How might I be more effective in calling is_prime()?