There are 69 of them: one such is 12.
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least two-digit composite number = 11
The largest 2 digit composite number is 99.
The smallest three digit composite number is 100, and the largest two digit number is 99. 100-99=1.
28 is an example of a 2 digit composite number because it has more than two factors.
The two-digit factors of 100 and 1000 are all composite.