They are not fractions, so they do not have denominators.
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What would be the ideal Common Denominator for 2 and 4?
6 is the least common denominator of a set of fractions having 2, 3, and 6 as denominators.
6
There is none because the Least Common Denominator (or LCD) is the Least Common Multiple (LCM) of the denominators of a pair of fractions.
I do it by finding a common denominator. For example, 2/3 - 1/5. The least common denominator is 15. 2/3 = 10/15, and 1/5 = 3/15, the difference of which is 7/15. Here is another example: 5/6 - 2/3. In this case, the least common denominator is 6. 2/3 = 4/6, and 5/6 - 4/6 = 1/6.