A rational number cannot also be irrational. A real number is either rational, or it is irrational.
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The factors of 585 are 1, 3, 5, 9, 13, 15, 39, 45, 65, 117, 195, and 585.
It is irrational.
Rational
Such a sum is always irrational.
The square root of 94 is an irrational number