A Prime number is a number that is only divisible by one and itself. For example, the number five is a prime number, but its multiples are not because they are divisible by five. The prime numbers from one to twenty are 2, 3, 5, 7, 11, 13, 17, and 19. A composite number is the opposite of a prime number. A composite number can be divided by more numbers than just one and itself. The composite numbers from one to twenty are 4, 6, 8, 9, 10, 12, 14, 15, 16, 18, and 20.
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The only prime factor of 4 is 2. No prime number is a multiple of 5.
5 is a prime number. Its only prime factor is itself.
5 is a prime factor of both numbers.
5 is the only prime number in which 5 is a factor.
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