To check the TV resolution on a Samsung TV, go to Settings and then Picture. From there, select Picture Size Settings and then Picture Size. You should see a list of resolutions, including 4K. If your TV is connected to a device that supports 4K, you can also check the resolution on that device.
Another way to check if your TV is 4K is to check the display settings on your TV. First, open up the TV's Settings menu. Next, look for the Display or Picture settings option. You should find all the information you're looking for about the TV's resolution. If it is 4K, it should show a resolution of 3840x2160p.
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You can also check if your TV is 4K by playing a 4K video on YouTube. Pause the video and click on More represented by three vertical dots on the left, and then click Stats for nerds. An overlay will give you your current video resolution.
Finally, you can check the user manual or packaging box for your TV to see if it has UHD written, which refers to 4K resolution.
In summary, you can check if your smart TV is 4K by checking the TV resolution on the settings menu, checking the display settings, playing a 4K video on YouTube, or checking the user manual or packaging box for UHD written.