The number \( \pi \) can be described as follows:
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Irrational Number: \( \pi \) is an irrational number because it cannot be expressed as a fraction of two integers.
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Not a Rational Number: Since it is irrational, it does not qualify as a rational number.
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Not an Integer: \( \pi \) is not an integer because integers are whole numbers that can be positive, negative, or zero, and \( \pi \) is not a whole number.
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Not a Whole Number: Whole numbers are non-negative integers (0, 1, 2, ...), and \( \pi \) is not a whole number.
Therefore, the correct description for \( \pi \) is that it is an irrational number.