Two factors.
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Seven is a prime number. A prime number has only itself and 1 as factors. So the factors of seven are 1 and 7. 1 and 7
7 is a prime number. The only factors of a prime number are 1 and itself, so 7 only has two factors.
70 is the smallest number that has prime factors of 2,5 and 7
Six: 1 3 7 9 21 63.
7 is a prime number .There are no factors for it.