$$\sqrt{ 997 \times 998 \times 999 \times 1000+1 }$$
$997001$
$$\sqrt{995006\times 999\times 1000+1}$$
$$\sqrt{994010994\times 1000+1}$$
$$\sqrt{994010994000+1}$$
$$\sqrt{994010994001}$$
$$997001$$
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