Rational
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Any number you can write in full using a finite number of digits and the symbols - and . only is a rational number.
It is rational
No because all integers are rational numbers
It is a rational number - as are ALL perfect squares.
No, and it is not irrational either. It is an imaginary number.
5, -7.986543, 37/91, sqrt(64), 193 are all rational. sqrt(2), pi, e, cuberoot(32) are all irrational.