def is_number(self) -> IsNumberRequestBuilder:
        """
        Provides operations to call the isNumber method.
        """
        from .is_number.is_number_request_builder import IsNumberRequestBuilder

        return IsNumberRequestBuilder(self.request_adapter, self.path_parameters)

        Provides operations to call the isNumber method.
        
msgraph/generated/drives/item/items/item/workbook/functions/functions_request_builder.py