SQL Server 2017

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DECLARE @BPA NVARCHAR(200) = 'hello it help';
DECLARE @SQ INT = 1;

select @BPA + @SQ;

Msg 245 Level 16 State 1 Line 4
Conversion failed when converting the nvarchar value 'hello it help' to data type int.

DECLARE @BPA NVARCHAR(200) = 'hello it help';
DECLARE @SQ INT = 1;

select @BPA +  CAST(@SQ AS NVARCHAR(10));

(No column name)

hello it help1

DECLARE @BPA NVARCHAR(200) = '2';
DECLARE @SQ INT = 1;

select @BPA +  CAST(@SQ AS NVARCHAR(10));

(No column name)

21