How many prime numbers are there in the list 1, 12, 123, 1234, 12 345, 123 456 ?
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Aside from 1 itself, all other numbers listed can be easily recognized as not being prime. Firstly, 12, 1234, and 123456 are all even numbers, and so each of them also has 2 as a factor. Secondly, 12, 123, 12345, and 123456 are each divisible by 3, so that is an additional factor for them. Lastly, 12345 is divisible as well by 5.
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