The square of -8 is:

1. -16

2. 16

3. -64

4. 64

Square root of 2.50 x 10³ is:

1. 5

2. 125

3. 50

4. none of the above

The smallest natural number by which should 175 be divided to get a perfect square number is:

1. 5

2. 7

3. 15

4. none of the above