Is the number 56 a rational number whole number natural number or irrational number?
56 is a rational whole natural number.
Or to put it another way:
56 is a Natural number, but as all natural numbers are also
whole numbers 56 is also a whole number, but as all whole numbers
are also rational numbers 56 is also a rational number.
Natural numbers are a [proper] subset of whole numbers;
Whole numbers are a [proper] subset of rational numbers.
The set of rational numbers along with the set of irrational
numbers make up the set of real numbers