why 1 is called a unique number

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.

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1 is a unique number as it is neither prime nor composite

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1 is called uniqe number because it is a 1st number

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1 is called unique number because it it niether prime nor composite . it is factor of all numbers . it has only one factor.

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1 is an unique number because it is neither prime nor composite.

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It is because it is neither a prime number nor a composite number
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because?
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