The decimal provided in the question is 0.222... . Look at the pattern that this decimal is following.
Here, the succession of numbers after the decimal point appears to be continually repeating a single digit - namely, the digit "2". This indicates that this value isn't a terminating decimal.
A terminating decimal would conclude with a final digit at some stage. As an example, if we had the decimal value, 0.25, it would be a terminating decimal - it stops after the digit "5".
However, here we have the digit "2" repeating indefinitely. It doesn't come to an end. Therefore, based on this pattern, we can categorically assert that the decimal number 0.222... is a repeating decimal. The repeating number here is "2".
So, the answer is 2.