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题库 / Prep2007E2-DS-2
If k is a positive integer, is k the square of an integer?
(1) k is divisible by 4.
(2) k is divisible by exactly four different prime numbers.
Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.
Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.
BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.
EACH statement ALONE is sufficient.
Statements (1) and (2) TOGETHER are NOT sufficient.
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② k is divisible by exactly four different prime numbers.
是说k可以被4个不同的质数整除，并不是只有四个质数（就算是这样也不行：2,2,3,3,5,5,7,7）.
可被四个不同的质数整除：2,3,5,7,2（比如由这5个数相乘）
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