No, always odd.
No. No number can have a factor greater than itself.
No.
The factor is 1.
It's never. A factor divides into a number without remainder, so the biggest it can be is the number itself.
The GCF is 3.
You cannot have a common factor with only one number. You must have at least 2 to compare the factors.
Two multiples of any number greater than one can't be co-prime. They would always have that number as a common factor.
The GCF will always be a positive number.
You cannot have a common factor with only one number. You must have at least 2 numbers to compare factors with.
No, the greatest common factor is never greater than the smallest number. The greatest common factor is the largest integer that divides evenly into all of the numbers listed.
Assuming the second even number is equal to 4 or greater, than the highest common factor of the two numbers is equal to an even number 2 or greater. Why can't an odd factor be used? Any odd factor must be multiplied by (at least) 2 to create an even product (ie. the 1st even number). That same odd factor must be multiplied by (at least 2) and any other number to create a 2nd even product, thereby making the Greatest Common Factor (at least) 2 times the odd number....which is an even number.
No prime number greater than 2 has 2 as a factor. A prime number has only two factors, 1 and the number itself. All prime numbers have 1 as a common factor. Numbers with any number besides 1 as common factors are composite numbers.