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11.56It's (3.4)2 .There are an infinite number of others.
NO!!! Think of the number line. ...-13,-12,-11, ,,,, -1,0,1,....11,12,13.... The half way point between '-12' & '12' is '0' (zero).
There are two, actually - 121 and 144. 121 is 11 x 11, and 144 is 12 x 12.