Multiplication By Patterns - 3

Algebra Level 1

972=94099972=99400999972=99940009 \begin{array} { r c l } 97 ^2 & = & 9409 \\ 997^2 & = & 994009 \\ 9997^2 & = & 99940009 \\ \end{array}

What is 999972 99997^2 ?

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