Not necessarily.
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If your talking maths then its 4 d if your talking viewing on a a screen 3d is 3 dimension and d is dimension
We watched the movie in 3D; in other words, in the third dimension, which is depth.
As you know, 3d stands for 3 dimensional. We see in 3d everyday. We can also move in 3d. We call it 3 dimensional because we can move (up and down, left to right, and forward and backwards). If you eliminate one of these sets of movements then you eliminate a dimension and you are now in 2d. We an see in the 2nd dimension and 1st dimension because we are at 3d. But we cannot see a 4d (if there is one. there are theories that there are an infinite number of dimensions) because we are not able to move with in the boundaries of 4d.
The 4th dimension is commonly regarded as time. So a 4D cube could be considered a 3D cube as it exists over time.
To explain multidimensional concepts is difficult. First a shadow is a two dimensional representation of a three dimensional object. You have to turn the object to see more than one side of the 3D object. A 3D object is a representation of a 4th dimensional object and a 4th dimensional objects represents the 5th dimension. To see pictures represented graphically a computer can help. If we research polytopes it will give examples.