Yes, four is a rational number.
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It is a rational number.
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.
Yes, it is.
4.7 is already a rational number. If you mean as a mixed number, this is equal to 4 7/10 or four and seven tenths.