Just two: 1 and the number itself.
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You factor the number into prime factors, dividing each prime out.
If you consider 1 and the prime number itself as factors then: 2If you do not consider 1 and the prime number as factors then: 0A prime number is one that does not have any factors apart from 1 and itself.
No - because its factors include each of the two prime numbers.
512 = 29 or 768 = 28*3 have 9 prime factors each.
No prime number only has one factor. Each prime number has itself and 1 as factors. Now, the number 1 of course has only one factor, but it is technically not a prime number.