a digit
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They both exclude fractions and irrational numbers. Natural numbers are a subset of whole numbers (also called integers); Natural numbers are any positive whole number (meaning any whole number 1 or greater). Whole numbers, also called integers, can be zero or negative.
a Whole number
Yes, by definition all positive integers are whole numbers.
31 is a whole number and it is also a prime number
It is rational and also a whole number.