You probably don't have to inspect that pair too closely.
Every integer IS a rational number.
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No. If it is an integer then it is a whole number.
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.
When expressed as a ratio of two integers (not intergers!), the simplest form for the integer but not others, has 1 as the denominator.
A rational number is either an integer or a fraction.