None. There is no perfect square that, when doubled, equals 60.
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504 x 504
21 times 3 equals 63
This equals 720.
Two times eighty four is one hundred and sixty four
28 is not a perfect square. A perfect square is an integer that is the square of another integer. 9 is a perfect square; it equal to 3 squared, or 3 X 3. Often, such numbers are called simply square numbers. While 28 is not a perfect square, it is a square number in the sense that it has a square root. by definition, the square root of 28 times itself equals 28.