posted by K on .
How many five-digit integers are perfect squares?
The smallest 5-digit number is 10000 and its square-root is 100.
The largest 5-digit number is 99999 and its square-root is 316.23.
Thus the square of all integers between 100 and 316 inclusively will yield a perfect square between 10000 and 99999.
How many integers are there?