【求助一道DS题】

Joyce74

If r and s are positive integers, is r/s an integer?
(1) Every factor of s is also a factor of r.
(2) Every prime factor of s is also a prime factor of  r

答案是A   
可是条件2为什么不充分呢？
Thanks♪(･ω･)ﾉ

kexzhang

举个例子，如果S=2^3*3^2，R=2^2*3^3, R/S=108/72， 这不就不是整数了么