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Magnitude of the Force F of gravitational attraction between two masses M and m, separated by a distance d, is given by:

F = G M m / d²

where G = Universal Gravitational Constant

The force is directional and is a vector. G is a scalar and is a constant. It is a scalar because it does not follow the law of addition of vectors.

Let G = G1 between masses M1, M. Let G = G2 between masses M2, M. Then the G3 between M1 and M2 is still same as G and not the vector addition of G1 and G2.

G is same in all directions and between any type of masses. Hence, it is directionless. So it is only a scalar.

F = G M m / d²

where G = Universal Gravitational Constant

The force is directional and is a vector. G is a scalar and is a constant. It is a scalar because it does not follow the law of addition of vectors.

Let G = G1 between masses M1, M. Let G = G2 between masses M2, M. Then the G3 between M1 and M2 is still same as G and not the vector addition of G1 and G2.

G is same in all directions and between any type of masses. Hence, it is directionless. So it is only a scalar.