6, 9, 14, 18, 21, 26, 39, 42, 63, 78, 91, 117, 126, 182, 234, 273, 546, 819, 1638
To find the prime factors of a number, start with any 2 factors and keep factoring the composite factors until all are prime. 1638 2 x 819 2 x 3 x 273 2 x 3 x 3 x 91 2 x 3 x 3 x 7 x 13 = 1638
2 x 3 x 3 x 7 x 13 = 1638 2,3,7 and 13 are prime.
It is: 2*3*3*7*13 = 1638 or as 2*32*7*13 = 1638
The composite factors of 75 are 15,25 and 75.
Composite because it has more factors than just 1 and itself. The factors are 1,2 3,6,9,18.
The composite factors of 22 are 1 and 22.
The composite factors of 45 are 9, 15 and 45.
The factors that are composite numbers, those that have more than two factors.
A composite number has three or more factors.
Factors can be prime or composite. The factors of 30 are 1,2,3,5,6,10,15 and 30. Of these, 3 and 5 are prime. The rest are composite except for 1, which is neither.
There are infinitely many composite numbers with infinitely many factors.
The composite factors of 42 are: 6, 14, 21, 42.