Answer:

Explanation:
Getting this answer can simply be achieved by process of elimination. I started dividing
by numbers that I knew had perfect squares, and eventually I found 16.

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As you can see above once I got 16 and 13, I found the square root of 16, which was four, and I checked to see if I could find the square root of 13 as well, but unlike 16 it doe snot have a perfect square.