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No, it's a scalar measurement because it has magnitude only. A vector measurement has both a magnitude and a direction.
It means that the direction of the vector is that same as before but the magnitude has been changed - by a scalar factor.
Maxwell's equations contain two scalar equations and two vector equations. Gauss' law and Gauss' law for magnetism are the scalar equations. The Maxwell-Faraday equation and Ampere's circuital law are the vector equations.
It depends on whether the "15" is a vector or a scalar. If it is a scalar then it indicates 15 steps in any direction. Only if it is a vector is the direction specified and then, 15 is the same number of steps in the opposite direction.