Get data

    x = Import["C:\\Book1.xlsx", {"Sheets", "Sheet1"}]

Recover the integers for instance like this

    y = Floor /@ x[[1]] // Flatten
    
    (* Out[202]= {Floor["Student ID"], 2014512060, 2013512024, 2013512028} *)

Just the data are then

    z = Drop[y,1]

    (* Out[203]= {2014512060, 2013512024, 2013512028} *)