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The answer seemed to be that it was the logic of enlightenment rationalism itself that gave rise to such barbarism.
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.
The idea is to look for a rational number that is close to the desired irrational number. You can find rational numbers that are as close as you want - for example, by calculating more decimal digits.