DATA SUFFICIENCY
Is the positive integer N equal to the square of an integer?
(1) For every prime number P, if P is a divisor of N, then so is P^2
(2) N^(1/2) is an integer.
答案:B
可我觉得(1)也对。我选D
整数N可以写成质因数相乘的形式 ,那么按(1)描述的,是不是可以理解为:N也包含这些质因数的平方相。所以,N可以等于一个数的平方。
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