I have a lymph node on the right side of my jaw which is around half and inch and it's also very movable. i also dont have a lymph node swollen on my left side tho. is this likely to be malignant?

Lymph nodes contain immune cells and get enlarged when there is local inflammation or infection. They are typically small, round, painful, and mobile. These resolve when the infection does. However, if they persist, or are rather large, growing, non-mobile, and non-tender, then these should get double checked, sometimes with a scan and biopsy. They can also be confused for cysts or lipomas.