No, 40 is a rational number.
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It is an irrational number, and therefore a real number.
An irrational number.
irrational
sqrt(40) or 2*sqrt(10) Evaluating the above will result in a decimal approximation which will be rational, not irrational.
Any whole number, any number with a finite number of decimals, and some numbers with an infinite number of decimals, are rational.