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Zero (0) is a rational number.
No, all integers are rational, whole numbers.
No, a rational number must be a whole number, for example 40 and 5643 and 948.
Yes, negative numbers can most certainly be rational. A rational number is simply a number which can be expressed as a fraction. An example of a negative rational number is: -1/2
An irrational number cannot be written as a fraction or to an exact decimal such as the symbol for pi or the square root of two. A rational number can be written in the form of a fraction or a decimal to an exact value.