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No for example the GCF of 24 and 36 is 12 which is a composite number

Q: Does the greatest common factor have to be a prime number?

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73 is a prime number so 51,3x17 and 73 only have the number 1 as the greatest common factor.

The GCF of any set of prime numbers is 1.

The greatest common factor of two or more prime numbers is 1.

As the numbers are all prime, the only factors each of them has are 1 and the number itself. Therefore the greatest, and only, common factor of two of more prime numbers is 1.

The greatest common factor of 185 is 1, because 185 is a prime number.

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Yes. The greatest common factor of 4 and 10 is 2, which is a prime number. The greatest common factor of 51 and 81 is 3, which is a prime number.

This is a question that cannot be answered. First, 64 is not a prime number. Second, the greatest common factor is the factor that two or more numbers have in common. There is no greatest common factor of a single number, such as 64.

5 is a prime number so the greatest common factor has to be the number 1.

The greatest common factor of 54 and 99 is 9, which is not prime. The greatest common factor of 80 and 114 is 2, which is prime.

Any two or more prime numbers have 1 as the greatest common factor.

No.

73 is a prime number so 51,3x17 and 73 only have the number 1 as the greatest common factor.

No.

There is no greatest common factor for 41 and 70 because 41 is a prime number.

Since the number 29 is prime, the greatest common factor of 15 and 29 is 1.

Since the number 7 is a prime number and not a factor of 26, the greatest common positive integer factor of 7 and 26 is 1.

You do not. To have a greatest common factor, you need two or more numbers. A common factor is a factor that two or more number have in common. However, the prime factorization of all the numbers will help you find the greatest common factor. The greatest common factor will be the prime factors they have in common multiplied together. Example: The prime factors of 45 are 3, 3, and 5. The prime factors of 60 are 2, 2, 3, and 5. The common prime factors are 3 and 5, so the greatest common factor is 3 x 5 = 15.