Yes. An integer is defined as a whole number either positive or negative.
Examples: 42, -99, 0
Non-Examples: pi, e, (infinity), -.007, 1.123
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Yes.Yes. The definition of integer is basically 'a whole number.'
No, it is not a natural number. It is not a whole, positive integer.
No, a real number could also be a rational number, an integer, a whole number, or a natural number. Irrational numbers fall into the same category of real numbers, but every real number is not an irrational number.
yes, 3 is a natural number. any positive number is.
Every irrational number, every rational number which is not an integer and every integer less than 2 falls into this category.