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A number such as 4, 25, 16, whose square root is an integer.
A perfect square.
* Its square root is a whole #. Example: 16 is a perfect square. Its square root is 4. 17 is not a perfect square. Its square root is around 4.123105626
A perfect square number is a number, whose square root is an integer. Examples are 1, 4, 9, 16, 25, .... The square roots of these numbers are {1,2,3,4,5,...} and {-1,-2,-3,-4,-5,...}
Yes, the number 512 is a squared number because it can be expressed as ( 512 = 16^2 ). In this case, 16 is the integer whose square equals 512. Therefore, 512 is indeed a perfect square.