Question

Find the number of digits in the square root of the following number (without any calculation).

$144$

Answer 1

If there are even number of digits in a square of a number then the square root has $\frac{n}{2}$ digits, if there are odd number of digits in a square of a number then the square root has $\frac{n+1}{2}$ digits
In this case, there are $3$ digits in $144$ hence, the square root has $2$ digits