144 has only one square, and that is 20,736.
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The subsets of all the square roots of 144 are {+12} and {-12}. The single set that includes all the square roots of 144 is {+12, -12}. That's all there are. There are no more.
They are: 121 144 169 and 196
Four answers are 121 144 169 196.
They are called perfect squares.
They are: 9 and 16