19. Find the smallest six-digit number which is a perfect square.
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smallest 6 digits=100000
=10^5
square root of 10^5=
√10^5=100√10= 316.23 ( √10=3.1623)
Now, to be the smallest number of six digits, the number must be greater than (316.23^2) and it's square root must be an integer.
the nearest integer to 316.23 that is greater than itself is 317.
therefore the smallest 6 digits perfect square will be=
317^2=100489
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