Nope!
When you leave a job where you had a 401(k), you won't be able to contribute to it anymore but you generally have 4 options for the funds in your account:
Leave it with your former employer’s plan — this is a good option if you’re happy with the investment options and fees in your plan. It can be harder to keep track of as your employer can change providers or initiate a ‘forced rollover’ if your plan has a small enough balance.
Roll it over into an IRA — this is a popular choice because IRAs typically have lower fees and aren’t tied to your employer so they can be easier to keep track of.
Roll it over into another 401(k) — if you have a 401(k) at your current job, you may be able to move your old 401(k) funds into your new account if the plan allows, but it’s not always possible.
Cash out — If you’re under 59 1/2 then a 401(k) withdrawal will usually lead to taxes and penalties on the money you with draw. You’ll also give up the opportunity for your 401(k) savings to grow tax-free over decades.