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A perfect square is a number that when applied by square root will render a whole number or you can say that it is the result when you square a whole number say 
1² = 1
2² = 4 
both 1 and 4 are perfect squares.
if we continue we'll have:
3² = 9
4² = 16
5² = 25
therefore 9 is the answer
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The perfect square their is 9 cause 3x3=9.
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