Special 4-Digit Square

A four digit integer \(\overline{abcd}\) satisfies the equation \[\left(\overline{abcd}\right)^2=\overline{wxyzabcd}\] where \(a,b,c,d,w,x,y,z\) are not necessarily distinct digits and \(a\ne 0,w\ne 0\). What is the value of \(\overline{wxyz}\)?

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