Pi is irrational.
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(pi) itself is an irrational number. The only multiples of it that can be rational are (pi) x (a rational number/pi) .
No, it is not.
No. pi/2 is a fraction but, since pi is irrational, so it pi/2.
Sometimes. The number '4' is real and rational. The number 'pi' is real but not rational.
The number "3.14159" by itself is rational, since it can be written as 314159/100000. However, the number pi (which is about 3.14159) is not rational, because it continues endlessly.