When using the magnification equation, a value greater than 1 as the solution for m indicates that the image is

larger than the object.
smaller than the object.
real.
virtual.

Larger than the object

Explanation:

The magnification of a lens/mirror is given by the equation:

where

is the size of the image

is the size of the object

from the formula, we see that if M is greater than 1, it means that

and so, it means that the image is larger than the object.

The negative sign simply tells if the image is upright or inverted: when M is positive, the image is upright, when M is negative, the image is inverted.