prevalence ratio question I understand that prevalence ratio is
                            Number of people in sample with characteristic
        Prevalence ratio =  ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
                                 Total # of people in sample

https://www.nimh.nih.gov/health/statistics/what-is-prevalence
My question is does the denominator in this formula include the numerator ? Are the number of people with disease included in the Total # of people in the sample ?

Yes. The denominator includes the numerator.
A prevalence can be understood as measuring the proportion of people in a population sharing some characteristic. So:
$$\text{Prevalence of }X\text{ in pop.} = \frac{\text{No. people with }X\text{ in pop.} }{\text{No. people with }X \text{ in pop.} + \text{No. people without }X \text{ in pop.}}$$
