Yes it is. Rational numbers are numbers that can be written as a fraction. Irrational Numbers cannot be expressed as a fraction.
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They can be but in general any number that can be expressed as a fraction is a rational number
Any number that can be expressed as a fraction is a rational number which includes whole numbers
-- Every whole number is a rational number. -- Any whole number divided by any whole number (except zero) produces a rational number.
There are infinitely many rational numbers between any two rational numbers. And the cardinality of irrational numbers between any two rational numbers is even greater.
Any other rational number.