The positive integer k has exactly two positive prime factors, 3 and 7. If k has a total of 6 positive factors, including 1 and k, what is the value of K? GMAT Explanation

The positive integer k has exactly two positive prime factors, 3 and 7. If k has a total of 6 positive factors, including 1 and k, what is the value of k?

(1) \( 3^2 \) is a factor of k
(2) \( 7^2 \) is NOT a factor of k

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Correct Answer: D