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.
The LCD for these two fractions is 6.