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A prime number has exactly two factors: itself and 1.
1 has one factor: itself.11 has two factors: one and itself.
The factors of 4 are 1, 2, and 4. The only prime factor of 4 is 2. The factors of 20 are 1, 2, 4, 5, 10, and 20. The prime factors of 20 are 2x2x5.
Each prime number has only two factors which are itself and one.
The set of factors includes one and the number itself. Proper factors do not include those two.