180, 376, 632, 956, 1317, 1840
Find the wrong number in the given series

The correct option is 1317.

To find the wrong number in the given series, let us analyze the differences between consecutive terms:

$376-180=196$

$632-376=256$

$956-632=324$

Notice that these differences are squares of consecutive even numbers:
$196={14}^2$
$256={16}^2$
$324={18}^2$

Following this pattern, the next difference should be ${20}^2=400$.

Adding $400$ to $956$ gives:
$956+400=1356$

Let us check the next difference with $1356$ using the next even square, which is ${22}^2=484$:
$1356+484=1840$

This matches the last term in the series ($1840$). Therefore, the number 1317 is incorrect and should be replaced by 1356.