Yes it’s a cutting.. many varieties are propagated this way, and most people will fail to mention cutting plants because grafted plants have many benefits.

i have a key lime, Meyer lemon, calamondin, kumquat, sanbokan lemon, all on their own roots. I only have one grafted, an Owari satsuma.

The key lime is extremely vigorous as a cutting, in my experience.

Well, now, I want to untangle the three plants. Just thinking, might be best to leave them, avoid the stress.

If you want to separate the plants, do it when the weather warms and you can keep them outdoors in dappled sun. I like to unpot them and swirl the rootball in a very large -- maybe 5-gal -- bucket of water. The soil should fall away and with the support of the water, you can gently tease apart the intertwined roots. This will help prevent root damage and shock. Have fun!!

I’ve separated many cuttings. They will lose some root hairs, but they will recover.

if you lose a lot of roots, maybe cut a couple leaves off.

Always better to separate them when they are smaller. As they grow, so do the roots and they become more entangled. They will recover better if divided young as well. Just don't set them in full sun right away. Set them in dappled shade for a few days, moving them a bit at a time into full sun. Good luck and happy growing.

Worried about seperating, the roots are a hot mess of tangle. Could I cut one down and treat as a sucker?

they are inside trees, only outside option is during summer it super hot direct sun and often high winds. Not the best area. So, I’ll just be keeping them inside. They are in front of a big window, full sun.