perfect square

noun Mathematics.
1.
a rational number that is equal to the square of another rational number.
2.
a polynomial that is the square of another polynomial.

Origin:
1935–40

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Example sentences
The second number is a four-digit number which is a perfect square.
Therefore, the solution may be irrational if the number you take the square root of is not a perfect square.
Do this by finding the nearest perfect square and taking its square root.
Including two portions owned by the school district, the shape of the land happens to be a perfect square.
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