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the correct definition of square root is:
a square root of of x is a number whose square is x
in other words,square root of any number is that number which can be multiplied by itself to obtain the given number
eg:√4=2  (because,2 can be multiplied by itself to get 4)
     √9=3  (because 3*3=9)

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Square is that multiplication of number by itself. square root is opposite of square.
symbole of square is √ it is called radical
ex. take square of 4 is 16 [4*4=16] 
 square root of 4 is 2 [√4 = 2]
in your ex. 3 square root of 3 is √3
[bcoz no multiplication of number by itself give 3]
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