3. Among the following four multiplication expressions, the product of expression (fill in the number) $\qquad$ is a multiple of 54.
(1) $261 \times 345$ :
(2) $234 \times 345$ :
(3) $256 \times 345$ :
(4) $562 \times 345$
【Analysis】Expression 1 cannot be divided by 2, expressions $3$ and $4$ cannot be divided by 9, in expression 2, 234 is a multiple of 18, 345 is a multiple of 3, the product is a multiple of 54