$${ 7 }^{ 2 } | { 1 }^{ 2 } { 7 }^{ 2 } { 9 }^{ 2 }$$
$194481$
$$49|1^{2}\times 7^{2}\times 9^{2}|$$
$$49|1\times 7^{2}\times 9^{2}|$$
$$49|1\times 49\times 9^{2}|$$
$$49|49\times 9^{2}|$$
$$49|49\times 81|$$
$$49|3969|$$
$$49\times 3969$$
$$194481$$
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$3^{4}\times 7^{4}$
