It can, since 0.999...=1. Therefore zero point nine repeating is an integer. Other repeating-decimal integers are 1.999..., 2.999...., -1.999..., etc.
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0.7777 repeating is a decimal.
3.66 repeating is a decimal.
0.370 repeating is a decimal.
1.21 repeating ... is a decimal.
3.25 repeating ... is a decimal.