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 #1
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Note that 62^2 = 3828 and 64^2 = 4096 and 4096 - 3828 = 268, so the larger square is 4096.

 Dec 8, 2020
 #2
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Thanks for trying but the answer is 4624

 Dec 8, 2020
 #3
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The first Guest's mistake was in saying that 622 equals 3828.  It does not. 

Even without checking it, you can see at a glance that 622 will end with a 4.  

 Dec 8, 2020

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