What is the image (range) of the function that assigns the square of an integer to this integer

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The function is: $f:\Z \to \Z$ defined by $f(n)=n^2, \forall n \in \Z$

Image(range) $:=\{n^2|n\in \Z\}=\{0,1,4,9,16,25,\ldots\}$

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Question ID: mtid-5-stid-8-sqid-354-qpid-241