If I take the value of something, say $50$g and I multiply that value by something else, so perhaps $50\text{g} \times 3$ what would that $3$ be called? It acts like a scalar but I'm not sure that definition applies when we're not talking about vectors.
Sorry if this isn't really maths. I'm not sure where else to ask this.
It is a scalar, but the term you are looking for may be "factor".
As in "multiply the weight ($50\mathrm g$) by a factor of $3$"