[計量] BigBook
P401 的第29題
A positive integer with exactly two different divisors
greater than 1 must be
(A) a prime
(B) an even integer
(C) a multiple of 3
(D) the square of a prime
(E) the square of an odd integer
答案是(D)
可是我不懂，這樣為什麼會有兩個不同的divisor
平方不就是兩個一樣的下去乘嗎？
謝謝
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