Because no matter what the number is, ' 1 ' is a factor, and the number itself
is also a factor. That's two of them. If there aren't any others, then the number
is a Prime number.
Examples: 2, 3, 5, 7, 11, 13
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A prime number has exactly two factors: itself and 1.
The prime factors are: 2 x 2 x 5
1 and 2
2 is a prime number because its only factors are one and itself. Since 2 is a prime number, if it is a factor of your number, it is a prime factor.
Prime factorization is the finding which prime number multiply to get to make the original number. Factors of 46: 1, 2, 23, 46 Prime Factors 2, 23 2 x 23 = 46