The number 31 is a rational number if 31 can be expressed as a ratio, as in RATIOnal.

A quotient is the result you get when you divide one number by another number. For 31 to be a rational number, the quotient of two integers must equal 31.

In other words, for 31 to be a rational number, 31 must be able to be expressed as a ratio where both the numerator and the denominator are integers (whole numbers).

The number 31 can be expressed as 31/1 where 31 is the numerator and 1 is the denominator.

Thus, the answer to the question "Is 31 a rational number?" is YES.

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