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The number 1 is not considered a prime, although it is a unique integer. The definition of a "prime" number is one that has exactly TWO factors: itself and 1. So the number 1, having only ONE factor, itself, does not meet the definition.

The exclusion of 0 and 1 allow us to use the term "prime" to define aspects of the integers that are "prime numbers."

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13y ago

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