These are known as prime. Some examples are 2, 3, 5, 7, and 11.
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Prime number
A prime number is a number that can only be divided by itself and one (1).
28 is a composite number because it can be divided by more numbers than it's self and one.
The only factors they have in common is one.
Do you mean a "prime" number? If so, a prime number is a number that can only be divided evenly by itself or the number one.