Nearly any number you can think of is a Real Number. So 8 is a real number.
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8 is a real number, as it exists on the number line. It is also a rational number, as it can be expressed as the ratio of two integers (8/1). Additionally, 8 is an integer, as it is a whole number without any fractional or decimal parts. However, it is not an irrational number, as irrational numbers cannot be expressed as a ratio of integers.
Yes
a real number is a number that can be rational or irrational
If a number is pure imaginary then it has no real component. If it is a real number, then there is no imaginary component. If it has both real and imaginary components, then it is a complex number.
2 is a real number.