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9, 16, and 25 are square numbers.
16 can have only one square and that is 256.
square numbers are the numbers that are... 1x1=1 2x2=4 3x3=9 4x4=16 ..... 1,4,9,16,25,36,49,64,81,100,121,144.........
1, 49 and 16 are square numbers.
They are square numbers.