Make a factor tree. I'll color them red when they're
prime, that is, they won't break down any further:



                             288
                             /\
                            2  144
                               /\ 
                             12  12
                             /\   /\
                            4  3 4  3
                           /\   /\
                          2  2 2  2

2·2·2·2·2·3·3 = 26·32

Edwin