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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有4个不同的质因子
K=abcd 每个质因子的指数不确定 如果指数是偶数，可以表现成x²
如果指数是奇数不行
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