$$\frac { \sqrt { 36 } \times \sqrt { 81 } \times \sqrt { 49 } \times \sqrt { 16 } } { \sqrt { 9 } \times \sqrt { 4 } }$$
$252$
$$\frac{6\sqrt{81}\sqrt{49}\sqrt{16}}{\sqrt{9}\sqrt{4}}$$
$$\frac{6\times 9\sqrt{49}\sqrt{16}}{\sqrt{9}\sqrt{4}}$$
$$\frac{54\sqrt{49}\sqrt{16}}{\sqrt{9}\sqrt{4}}$$
$$\frac{54\times 7\sqrt{16}}{\sqrt{9}\sqrt{4}}$$
$$\frac{378\sqrt{16}}{\sqrt{9}\sqrt{4}}$$
$$\frac{378\times 4}{\sqrt{9}\sqrt{4}}$$
$$\frac{1512}{\sqrt{9}\sqrt{4}}$$
$$\frac{1512}{3\sqrt{4}}$$
$$\frac{1512}{3\times 2}$$
$$\frac{1512}{6}$$
$$252$$
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$2^{2}\times 3^{2}\times 7$
