nope, stainless is non magnetic...
Only Austenitic, Martensitic, and Ferritic, are generally magnetic.
There is no specific generalisation as it depends on the composition.
18/8, 304, typically is Austenitic and non magnetic, this would be used for marine applications, high temperature, high corrosion resistance, and such things as cookware, and generally often cutlery. They cannot be hardened by heat treatment, but are cold-work hardening, so are often used as a hard surfacing material on lower quality materials.
However, Martensitic is better for anything that requires heat treatment to harden & temper, such as knife blades, so it finds its way into such applications as surgical scalpels. It also has higher mechanical "strength", however, it is not as corrosion resistant as Austenitic & Ferritic. So hard, strong & wear resistant. Magnetic.
Ferritic, generally has better machinability. It is actually more corrosion resistant in general than Austenitic, it is however, as it's type name suggests magnetic, as it's primary grain structure is ferrite.