The answer depends on what particular way!
You call the fraction irrefutably prime.
A unit fraction.
A unit fraction.
compound fraction
dialect
1 in fraction is a whole number.
like fraction
A mixed fraction.
improper fraction
You can reduce a fraction to its simplest form.
It is part of a complex fraction.
There is no vertical bar in a fraction. A fraction is written with either a horizontal bar or a slanted bar, which is technically called a "vinculum", but most people call it a "fraction bar".