3.4 is rational.
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It is Real, Rational, Integer, Whole and Counting but not Irrational
rational
The square root of 25 is 5, which is a whole number, an integer, a natural number and a rational number.
No because 225 is an integer and all whole numbers are rational
Some definitions maintain that the set of whole numbers does not include negative numbers. That makes -12 an integer and rational.