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A rational number is one that has an ending.
If you mean 213 then it is a rational number because all integers or whole numbers are rational numbers.
It depends on if it is continued or not. A terminal decimal is always rational (such as 0.5) If it has a repeating pattern, its also rational (0.3333333333333333). If you mean 0.50550555055550555550555555 etc.) this is not rational.
0.3 is a rational number. The fact that it is expressed as a decimal does not mean it is not rational. As a ratio, it can be written as 3/10.
It is neither but if you mean the square root of 100 then it is 10 which is a rational number