Answer
$3^2\times7^2$
Work Step by Step
$\ \ 441$
$\swarrow\searrow$
$3\ \ \ \ 147$
$\ \ \ \ \swarrow\searrow$
$\ \ \ 3\ \ \ \ \ \ \ 49$
$\ \ \ \ \ \ \ \ \ \swarrow\searrow$
$\ \ \ \ \ \ \ \ \ \ 7\ \ \ \ \ 7$
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