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No, it is a rational number because it can be expressed in fraction form: -71/1
The square root of 71 is an irrational number
Yes, an number that can be written as a ratio of integers is rational. .7 is 7/10 .71 is 71/100 .714 is 714/1000 .7142 is 7142/10000 etc. Can you see how .7142857 must be rational? However, if you allow the 7 at the end to repeat, then that changes things.
21/71 is rational. Rational numbers are numbers that can be written as a fraction. Irrational numbers cannot be expressed as a fraction.
71 is an integer and not a fraction. However, it can be expressed in rational form as 71/1.