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189 = 3 x 3 x 3 x 7 = 33 x 7
No. 189 is not prime because it is divisible by 9.
The factors of 189 are the numbers that can be multiplied together to give 189. The factors of 189 are 1, 3, 7, 9, 21, 27, 63, and 189. The prime factors of 189 are the prime numbers that can be multiplied together to give 189. The prime factors of 189 are 3 and 7.
3*3*3*7 = 189 or 33*7 = 189
The greatest common factor (GCF) refers to a factor that is COMMON to two or more numbers. You have only one number in the question! The greatest factor of any number is itself. Prime factorisation is irrelevant in finding the GCF of a single number.