A number that has a square root has to be able to be the product of two of the same numbers.
Example:
4 x 4 = 16
16 can have a square root because 4 and 4 are the same.
10 can't have a square root because 2 x 5 = 10, and 2 and 5 aren't the same numbers.
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irrational
An "imaginary" number. Those number are called imaginary for historical reasons, but they have very "real" practical applications. The result is written as root(17)i (replace root(17) with the square root symbol).
3 is the square root of 9. 9 is a square number. 9 is the square root of 81. 81 is a square number.
No - a natural number is a whole number. Therefore, the square root of 49 is a natural number, but the square root of 50 is not.
The square root of 51 is an irrational number and it is about 7.14128429