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Is 1 a prime number - Mathsoft StudyWorks! Middle School Deluxe Math 5.0 (11543) for PC

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k24674

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No, 1 is not a prime number. The decomposition of a number into prime factors must be unique so 2=1x2 is prime but since 1 can be written as 1=1x1x1x1....x1 with an arbitrary number of factors this opens up a can of worms as far as unicity of the decomposition is concerned. Conclusion: 1 has been ruled out as a prime number.
I hope that this gives you an idea why 1 is no longer considered prime.

Posted on Jul 11, 2012

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