Squareof any positive integer is on the form of3mor3m +1
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Square of any positive integer is in the form of 3m or3m+1
According to Euclid division lemma a=bq+r
Where b=6
r=0,1,2
1st case,
r=0
a=3q+0
Squaring on both sides
a^2 = (3q)^2
Which give a^2 = 9q^2..m
Like that now you do for 3q+1 and 3q+2 that's it
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