How many digits does $\sqrt{998001}$ have?

How many digits does $\sqrt{998001}$ have?
  1. $3$
  2. $4$
  3. $5$
  4. $6$

Solution

$999^{2} = 998001$, so $\sqrt{998001} = 999$, which has $3$ digits.

Asked in: IMO

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