Prime+&++Composite

=Is 15 Prime or composite 15 Is composite because 15 has 3 factor's. The factor's are 1,3 & because: = =15x1=15 The definition of = =3x5=15 prime or composite = =5x3=15 is that if there's a 2 = =1x15=15 factor's. If there's = = 3 or more factor's it's. = = Composite & if it's Prime it has less then 2 factor's! :) =