@ @¶ìÿa@óÝy‹¾a@ u@ @R . n 8 = 2 ×2 × 2 = 23 )2 )2 .3 ( an .na an = a ×a ×…×a ×a n p1 p .(Prime number) .(Composite number) 2, 3, 5, 7 ,11,13,17,19,… .( 1 [Some Divisibility Tests] a (.) ab (a b ) b . 2 () 6=3 6 2 . 2 N . 7 7 2 ) : N2 .( 0