Stress is a tensor because it affects the datum plane. When this is affected and it changes, it is then considered a tensor.

If the surface area is very very small then stress is a Tensor quantity....

-MOGRE

Stress is tensor quantity. The stress tensor has 9 components. Each of its components has a magnitude (a scalar) and two directions associated with it.

Stress is tensor quantity. The stress tensor has 9 components. Each of its components has a magnitude (a scalar) and two directions associated with it.

stress is having magnitude, direction and point of application of force