It can't be one. Mixed numbers are greater than one.
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66/1
066 = 66 is an integer and not a fraction. However, it can be expressed in rational form as 66/1. You can then calculate equivalent rational fractions if you multiply both, its numerator and denominator, by any non-zero integer.
98 is an integer and there is no sensible way of representing it as a mixed fraction.
A mixed number
It is a fraction - which may be mixed or proper.