$$994\cdot994 = 1000-6$$
Answer
This equation has no solution.
Explanation
$$ \begin{aligned} 994\cdot994 &= 1000-6&& \text{simplify left and right hand side} \\[1 em]988036 &= 994&& \\[1 em] \end{aligned} $$
Since the statement $ \color{red}{ 988036 = 994 } $ is FALSE, we conclude that the equation has no solution.
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