Yes, they all are. A rational number is one that can be written as a fraction. Any integer can be written as a fraction by putting it on top (making the integer the numerator) and putting a "1" on the bottom.
Yes. Absolutely EVERY integer is a rational number. A rational number is one that can be written as a RATI0 (fraction) of two integers. So for example, 7 is an integer but could also be represnted by 14/2 or 21/3 etc. Even 0 can be 0/7 or 0/91 etc.
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All integers are rational numbers.
Every counting number, and the negative of it, are real, rational integers.
-5 is an integer and a rational number. Integers can be positive or negative. Rational numbers can be expressed as a fraction of integers.
Integers are rational.
Any number that can be expressed as the ratio of two integers is a rational number.