A rational number is either an integer or a fraction.
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Every integer is a rational number.
A rational number which is an integer can be simplified to a form in which the denominator is 1. That is not possible for a rational number which is not an integer.
Zero is a rational number and an integer.
Every integer (note spelling) is a rational number.
-6.6 is a rational number but it is not an integer because it is not a whole number