All four sides being the same length.
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55*55 = 3025 or (-55)*(-55) = 3025 which makes 3025 the square of the integers ±55, and thus a perfect square.
All numbers can make a square. Every real number makes a positive real square. Every rational number makes a rational square. Every integer makes a perfect square.
121
64
No, 325 is not a perfect square however 324 is a perfect square.