Question 1207656
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A positive integer has exactly 3 positive divisors if and only if its prime factorization is p^2, where p is a prime number.<br>
The smallest positive integer with exactly 3 positive divisors is p^2, where p is the smallest prime number.  The smallest prime number is 2, so the smallest positive integer with exactly 3 positive divisors is 2^2 = 4.<br>
ANSWER: 4<br>