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why is e an 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.
E not only can be irrational, it is.
Irrational.
There cannot be a proof since your assertion is not necessarily true.
sqrt(2)*sqrt(3) = sqrt(6). All three are irrational numbers.