No, it is an integer; all integers are rational.
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No. 144 can be expressed as a ratio of two integers: 144/1 and so it is rational.
144 is rational. It is a whole number, it is an integer, etc.......
sqrt(144) = 12. 12 is the ratio of 12 to 1, so it's nice and rational.
no square root of 9 is 3 which is rational -- to be more specific: an irrational number is a number that cannot be expressed as a fraction. Pi, for example, is one of these numbers. If a number is not a perfect square (4, 16, 9, 144, 225, etc.), then it's square root is likely to be an irrational number. For example, the square root of 2 (1.41421356...) is an irrational number because it cannot accurately be expressed as a fraction.
The sum of a rational and irrational number must be an irrational number.
rational * irrational = irrational.