There are $500$ children in a school. For a P.T. drill they have to stand in such a manner that the number of rows is equal to number of columns. How many children would be left out in this arrangement?

Find the perfect square numbers between $30$ and $40$.

Find the perfect square numbers between $50$ and $60$.

Can you say whether the following number is perfect square? How do you know?

$1057$

Can you say whether the following number is perfect square? How do you know?

$23453$

Can you say whether the following number is perfect square? How do you know?

$7928$

Can you say whether the following number is perfect square? How do you know?

$222222$

Can you say whether the following number is perfect square? How do you know?

$1069$

Can you say whether the following number is perfect square? How do you know?

$2061$