If the units digit of a number is 2 then it does not have a square root .Is the given statement true?

Property 1 If the units digit of a number is 237 or 8 then it does not have a square root in N( the set of natural numbers).

Property 2 The number ends in an odd number of zeros then it does not have a square root.If a square number is followed by an even number of zeros it has a square root in which the number of zero in the end is half the number of zero in the number.

If the units digits of a perfect square is 4 then the units digit of its square root can be

Property 6 The units digit of the square of a natural number is the units digit of the square of the digit at units place of the given natural number.

If the units digit of a perfect square is 5 then the units digit of its square root is _________

The square root of a prime number can be obtained approximately but not exactly .Is the given statement true?