Or I should say, I’m assuming it’s not hardwood.

It LOOKS like hardwood in the picture. Are there any heat vents in the floor that you could lift out to see the raw floor edges? Can you run your fingers over it and feel any seams?

Hardwood can be amazingly smooth and silky. You know that most every basketball court is real hardwood? It’s very very smooth.

3" is an odd size flooring width. Solid hardwood is available at 3 1/4" for a standard size. You have engineered red oak flooring. The thickness is most likely 3/8". Which has been glued down. To confirm, knock on the floor. If, you have a solid knock, it's engineered glue down. If, it's hollow, you have a floating floor or hollow spots in your glue down flooring.

This is rotary peeled engineered red oak with a very thin wear layer. It’ll be able to be sanded once. After that, it’s a rip out