Absolutely. Only fractions can be irrational, numerically speaking (people can also be irrational, but that's a different use of the word).
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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.
Every irrational number, every rational number which is not an integer and every integer less than 2 falls into this category.
well every integer fraction whole number natural number are rational number's surely rational numbers are represented on a number line and as rational numbers are the real numbers
No. To be a rational number it must be an integer over another integer. π is not an integer, nor can it be made into an integer by multiplying it by another integer, thus one twelfth of π is not a rational number.
Yes and yes. It is an integer and so it is also a rational number.