what number is not a prime factor
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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
A composite factor is a factor that is a composite number, as opposed to a prime factor which is a factor that is a prime number.
11 is a prime number its factors are therefore 1 and 11 the only factor in common with 100 is 1
Considering that 100 = (2^2)*(5^5) and 38 = (2^1)*(19^1), we can see that 2 is the greatest common prime factor between 100 and 38. If the question meant the greatest prime factor of either 100 or 38, then the answer is 19.
Okay The FACTORS are 100:1,2,4,5,10,20,25,50,100 63:1,3,7,9,21,63 32:1,2,4,8,16,32 49:1,7,49 Then A prime factor Is a number with 1 and the number It's self. (eg.2 Prime Number Because the factor for 2 is 1 and 2) It's self