625.89 is rational. Rational numbers are numbers that can be written as a fraction. Irrational Numbers cannot be expressed as a fraction.
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If it says "negative irrational", then obviously it is irrational.
Irrational Number
The sum of two irrational numbers may be rational, or irrational.
it is a rational number but 4.121314..... is an irrational no
4.6 is rational.