No, it is not.
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Irrational.
The square root of 55 is an irrational number, meaning it never ends and doesn't have a repeating digit pattern, so it has an infinite number of digits.
No, it's a rational number. It's the ratio of 55/100, or 11/20. (They're the same.)
yes
Yes. The sum of two irrational numbers can be rational, or irrational.