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Yes and yes. It is an integer and so it is also a rational number.
A rational number is any number which can be written as a quotient of 2 integers i.e can be expressed as a/b. So six rational numbers between 3 and 4 would be 10/3, 17/5, 19/6, 11/3, 13/4, 22/7 Though there are many more than that.
Add 1/4 and 2/3. This results in 11/12. Then divide by 2 (or multiply by 1/2). The answer is 11/24 or about .458333.
3.6666 is the ratio of 36,666 to 10,000 . It's perfectly rational. If you said that the sixes go on forever and never end, then your number would be equal to 11/3 which is also perfectly rational.
3.18 IS a rational number. The fact that it is expressed as a terminating decimal does not mean it is not rational. As a ratio, it can be written as 318/100. You may simplify that ratio if you so wish.