Yes. According to Wikipedia, "In mathematics, a rational number is any number that can be expressed as the quotient or fraction a/b of two integers, with the denominator b not equal to zero. Since b may be equal to 1, every integer is a rational number."
So 84 can be expressed as 84/1, therefore it is a rational number.
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Yes, four is a rational number.
It is a rational number.
Six hundred and eighty-four thousandths = 600.084 Six hundred eighty-four thousandths = 0.684
No it is rational ( all integers are rational)
5/4 or five divided by four. A "rational" number is a number that can be written as a ratio or fraction.