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3 and 9 are factors of 18. 3 is prime, 9 isn't.

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Q: Is 3 or 9 a prime factor of 18?
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Is 9 a prime number and a factor of 18?

No. 9 is a composite number (3 x 3). But it is a factor of 18. Factors of 18 are 1, 2, 3, 6, 9, 18. 18 = 2 x 3 x 3


What is the greatest common factor for 18 and 81?

The factors of 18 are 1, 2, 3, 6, 9, and 18. The factors of 81 are 1, 3, 9, 27, and 81. The common factors are 1, 3, and 9. Therefore, the greatest common factor is 9. You can also determine the greatest common factor from the prime factors. The prime factors of 18 are 2, 3, and 3. The prime factors of 81 are 3, 3, 3, and 3. The prime factors in common are 3 and 3, so the greatest common factor is 3 x 3 = 9.


What is the factor and prime numbers for 18?

The factors of 18 are: 1 2 3 6 9 18The prime factors are: 2 3


What is the greatest common factor of 9 18 and 45?

9 is a factor of both 18 and 45, and is the largest factor of itself, so 9 is the greatest common factor.One way to determine the greatest common factor is to find all the factors of the numbers and compare them.The factors of 9 are 1, 3, and 9.The factors of 18 are 1, 2, 3, 6, 9, and 18.The factors of 45 are 1, 3, 5, 9, 15, and 45.The common factors are 1, 3, and 9. Therefore, 9 is the greatest common factor.The greatest common factor can also be calculated by identifying the common prime factors and multiplying them together.The prime factors of 9 are 3 and 3.The prime factors of 18 are 2, 3, and 3.The prime factors of 45 are 3, 3, and 5.The prime factors they all have in common are 3 and 3, so the greatest common factor is 3 x 3 = 9.WHAT? evry gcf # has to be PRIME only? HELP!!!!!!!!


What is the greatest common factor of 18 27 and 36?

The greatest common factor of 18, 27, and 36 is 9 The prime factorization of 18 is 2*3*3 The prime factorization of 27 is 3*3*3 The prime factorization of 36 is 2*2*3*3 The GCF is 3*3 = 9.


Is 9 a prime factor?

9 is not a prime factor, but it does have one prime factor, which is three. Prime factors are factors of a number that are prime.


What are the factor and prime factor of 36?

Factors: 1, 2, 3, 4, 6, 9, 12, 18, 36.Prime Factors: 2, 3


What is the greatest common factor of 18 27 and 63?

The GCF of 18, 27, and 63 is 9. The prime factorization of 18 is 2*3*3 The prime factorization of 27 is 3*3*3 The prime factorization of 63 is 3*3*7 The GCF is 3*3 = 9.


What is the largest prime of 18 and 24?

largest prime factor of 18 & 24 = 3factors of :18= 1, 3, 6, 9, 1824= 1, 2, 3,4, 6, 8, 12, 24,prime factors of 18 & 24 = 2, 3largest prime factor of 18 & 24 = 3


What is the greatest common factor of 18 99 and 135?

The GCF of 18, 99, and 135 is 9.The prime factorization of 18 is 2*3*3The prime factorization of 99 is 3*3*11The prime factorization of 135 is 5*3*3*3Thus the GCF of 18, 99 and 135 is 9.


What is the greatest common factor of 18 27 and 99?

The GCF of 18, 27, and 99 is 9. The prime factorization of 18 is 2*3*3. The prime factorization of 27 is 3*3*3 The prime factorization of 99 is 3*3*11 So the GCF = 3*3 = 9.


What is the greatest common factor of 18 and 27?

The greatest common factor of 18 and 27 is 9.The common factors of 18 and 27 are 1, 3, and 9.Methods:One way is to make an educated guess. If you recognize that both numbers are divisible by 9, check whether the corresponding factors of the factor pairs have common factors. Note: When the sum of the digits of a number add up to 9 or a multiple of 9, that number is divisible by 9.9 x 3 = 27Since the corresponding factors of the factor pairs, 2 and 3, do not have any common factors, the greatest common factor is 9.Another way to determine the common factors and greatest common factor is to find all the factors of the numbers and compare them.The factors of 18 are 1, 2, 3, 6, 9, and 18.The factors of 27 are 1, 3, 9, and 27.The common factors are 1, 3, and 9. Therefore, the greatest common factor is 9.The greatest common factor can also be calculated by identifying the common prime factors and multiplying them together.The prime factors of 18 are 2, 3, and 3.The prime factors of 27 are 3, 3, and 3.The prime factors they have in common are 3 and 3, so the greatest common factor is 3 x 3 = 9.