why is 1 a unique number ?rn
why is 0 a whole number
Mathematics is a subject which is creation of mind not based on observation like science.
The set of whole number is predefined in mathematics involving all the natural number and 0. There isn't any particular reason specifying why '0'is a whole number.
@Amelie: You had perfectly answered the reason for 1 being a unique number. Keep Posting.
- 1 is called a unique number because it is neither a prime number nor a composite number. It has only one factor, i.e, the number itself; and to be a composite number also the number must have two factors, i.e, 1 and the number; and a prime number also must have more than two factors. Therefore, 1 is neither prime nor composite. That 's why 1 is a unique number.