A number that multiply by - 15 can give me adding + 2

If you mean a number when multiplied by - 15 will give you + 2, then the answer is

-15 times x=2

divide both sdies by - 15

x=2/-15=-1/7.5

x=1/7.5

or if you mean what 2 number multily to get - 15 and add to get 2, then the numbers are - 3 and 5

when multiplied they give-15

when added together they give 2