All the same colour
ListPlot[MapIndexed[{#2[[1]], #1} &, Prime[Range[25]]]]
All different colours
ListPlot[MapIndexed[List@{#2[[1]], #1} &, Prime[Range[25]]]]
All the same colour
ListPlot[MapIndexed[{#2[[1]], #1} &, Prime[Range[25]]]]
All different colours
ListPlot[MapIndexed[List@{#2[[1]], #1} &, Prime[Range[25]]]]