No. The number pi is irrational, and if you multiply an irrational number by a non-zero rational number (in this case, -2), you will get another irrational number.As a general guideline, most calculations that involve Irrational Numbers will again give you an irrational number.
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No, -5 is a negative, rational number.
-23 is a rational number
Yes, -56 is a rational number
When the numbers are negative
a negative rational number