Identify the lowest composite number that is a factor of 28.
To find the lowest composite number that is a factor of 28, we need to find the smallest number other than 1 that divides 28 evenly.
The factors of 28 are: 1, 2, 4, 7, 14, and 28.
Since we are looking for the lowest composite number, we can eliminate the prime numbers: 2, 7, and 28.
Out of the remaining factors, the smallest composite number is 4.
Therefore, the lowest composite number that is a factor of 28 is 4.