Squares of Numbers of the form "111 . . . 1"

Q. Which among the following is a composite number?

1. $5$
2. $37$
3. $19$
4. $111$

Q. Which among the following is NOT a perfect square?

1. $121$
2. $12,321$
3. $1,331$
4. $1,234,321$

Q. The square of which among the following numbers is a palindrome?

1. ${122}^2$
2. ${125}^2$
3. ${127}^2$
4. ${111}^2$

Q. Select the option regarding the correctness of the following statement:

The squares of the numbers of the form $1,11,111,1111,11111,...$ are the palindrome numbers.

1. True
2. False
3. Cannot be determined

Q. What is the value of $1,{111}^2$?

1. $121$
2. $12,321$
3. $1,234,321$
4. $123,454,321$

Q.

Fill in the suitable integer in the box.

$\square +11=0.$

Q.

Complete the following:

$7^2=49$

So, $\sqrt{49}=$ ___________.

Q.

Complete the following:

${18}^2=324$

So, $\sqrt{324}=$ _________.