The nature of a vector may or may not be changed when it is multiplied.
For example, when a vector is multiplied by a pure number like 1, 2, 3, .... etc., then the nature of the vector does not change.
On the other hand, when a vector is multiplied by. a scalar physical quantity, then the nature of the vector changes. For example, when acceleration (vector) is multiplied by mass (scalar) of a body, then it gives force (a vector quantity) whose nature is different than acceleration.