讨论一道机经题,都来讨论亚

How many different factors does the integer n have?

(1)n=a^4b^3,where a and b are different positive prime numbers

(2)the only positive prime numbers that are factors of n are 5 and 7

(2) does not rule out 2 as being a factor of n

可是他说了仅有的正的质数是5和7，难道不是已经排除了2吗？

另外，因子是不是一定是质数呢？