It is rational
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Rational
5, -7.986543, 37/91, sqrt(64), 193 are all rational. sqrt(2), pi, e, cuberoot(32) are all irrational.
If it ends there, it is rational. If it continues with the same digit (2 in this case) over and over, it is also rational.
If you multiply or divide an irrational number - such as pi - by ANY rational number (except zero), you will ALWAYS get an irrational number.
Sometimes. eg the irrational number √2 squared is 2 which is rational (2 = 2/1) eg the irrational number √(√2) squared is √2 which is irrational.