Changed array mult to listOfNonPrimes to reflect what it actually is
changed called index by -1 for some calls to listOfPrimes to reflect earlier change to 1-indexed to 0-indexed
Corrected missing fix of mult to listOfNonPrimes
moved prime checker off to own function

Also fixed syntax error for listOfNonPrimes initialization
updated method comments, and moved private function comments into inside comments, rather than document comments
Futher changes to the class documentation comment