What number goes into 171 evenly?
None!!! Because '171' is NOT an EVEN number.
Remember even numbers end in 0,2,4,6,and 8.
Since '171', does not end in 0,2,4,6 or 8 , then it is not an even number, so it will not divide evenly.
NB However, you can divide '171' by '2' , and the answer is 85.5 or 85 1/2