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600 sixes (Posted on 2019-02-11) Difficulty: 1 of 5
Can a number consisting of 600 sixes and some zeros be a square?

No Solution Yet Submitted by Danish Ahmed Khan    
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Quick Solution | Comment 1 of 2
No.   No amount of 6's is possible.  If the number ends in 00, then the number divided by 100 is a square.  No square ends in 60, since its square root would end in 0.  If the number ends in 6,  the last two digits are either 13, 36, 56, 76, 96.
  Posted by Jer on 2019-02-11 15:07:48
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