What is perfect a square?
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A perfect square is a number, from a given number system, that can be expressed as the square of a number from the same number system.
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If a number ends in 0, 1, 4, 5, 6 or 9, then it can be a perfect square. A perfect square can only have an even number of zeroes at the end.
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If a number is a square of an odd number, then it must be written as a sum of consecutive numbers.
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