An integer is a whole number, like 0, or 9, or 1234.

The basic syntax used to determine if a variable or parameter is an integer is:

if VariableOrParameter EQU +VariableOrParameter CommandToExecuteIfInteger

Samples:
if %1 EQU +%1 @echo %1 is an integer.                              if %1 NEQ +%1 goto error                              if %var% EQU +%var% @echo Variable var contains an integer.                              For /f "Tokens=*" %%a in ('type %1') do (                               if %%a NEQ +%%a @echo Line containing \{%%a\} in file %1 is NOT an integer.                              )