@@ROWCOUNT

Example:

DECLARE @Xtable TABLE(Col1 INT);

INSERT INTO @Xtable (Col1)
VALUES(1), (2), (3), (4), (5), (6), (7), (8), (9);

SELECT * FROM @Xtable;

SELECT @@ROWCOUNT AS [ROWCOUNT];

UPDATE @Xtable
  SET
    Col1 = 0
WHERE Col1 % 2 = 0;

SELECT @@ROWCOUNT AS [ROWCOUNT];

SELECT * FROM @Xtable;