Multiple choice general knowledge math & puzzles

Identify the Achilles Number

  1. 332

  2. 156

  3. 108

  4. 224
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C Correct answer
Explanation

An Achilles number is a number that is powerful (each prime factor appears at least squared) but not a perfect power. 108 = 2^2 * 3^3. It is powerful because 2 and 3 are squared/cubed, but it is not a perfect power (like 64 or 81).

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