Not always. For example sqrt(2) and 1/sqrt(2) are both irrational, but their product is the rational number 1.
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The square root of 84 is irrational and is approx 9.1652.
Can be irrational or rational.1 [rational] * sqrt(2) [irrational] = sqrt(2) [irrational]0 [rational] * sqrt(2) [irrational] = 0 [rational]
No. 0.9 is rational. It is equal to 9/10.
Since pi is irrational, any multiple of it is too.