No
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sqrt(2) is irrational. 3 is rational. The product of an irrational and a non-zero rational is irrational. A more fundamental proof would follow the lines of the proof that sqrt(2) is irrational.
The square roots of 2 and 3 are irrational but not transcendent.
Yes, multiplying a rational and an irrational number gives an irrational product. For example 3 * pi = 3pi = 9.424789... or 2 * sqrt 2 = 2^(3/2).
No, 3 is a rational number. Pi and the square root of 2 are irrational numbers.
No. It can be written as -2/3.