The square root of any integer that is not a perfect square will be irrational.
√5 is irrational
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Any decimal number that terminates or repeats is a rational number, regardless of sign. All of the decimal numbers shown are rational. (All terminate after a finite number of digits.)
Of course, any <em>ratio</em> of integers is a <em>ratio</em>nal number. That's what the word "rational" means.