No.
3 = 3/1 which is of the form a/b (with a & b integers) which is a rational number
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It is irrational.
Yes, √3 + √5 is irrational.
YES.... squre root of 3 is in irrational number..
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.
No, 3 is a rational number. Pi and the square root of 2 are irrational numbers.