No.
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No. 4 would be an integer. 4.1 is a decimal number. For that matter, 4.0 would also be a decimal number, because the decimal is specified.
Yes it is.
41 is an integer and not a fraction. However, it can be expressed in rational form as 41/1. You can then calculate equivalent rational fractions if you multiply both, its numerator and denominator, by any non-zero integer.
The next odd integer after 40 is 41
60
41