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There is no such thing.

Q: A factor that is also a prime number?

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That's a prime factor.

5 is a prime factor of both numbers.

Yes.

a prime factor

No. The only factors of a prime number are 1 and itself. The only way that 21 could be a factor of a prime number is if it were a prime number, but it is not because 21 is also divisible by 3 and 7.

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That's a prime factor.

5 is a prime factor of both numbers.

Yes.

Yes. 1,693 is a prime number and so it is also a prime factor.

Yes. Since 127 is a prime number it is also a prime factor.

a prime factor

A factor can or cannot be a prime number Ex: 2 is the factor of all other even numbers its a prime number but 9 is a factor of 18 and its not a prime number A prime is a factor but a factor being a prime number varies

30 has three prime numbers and is a factor of 60.

No. The only factors of a prime number are 1 and itself. The only way that 21 could be a factor of a prime number is if it were a prime number, but it is not because 21 is also divisible by 3 and 7.

2 and 5

They are: 3 and 7

3 and 7