It’s neither hinted nor implied he is, no. I won’t try to make THAT argument as there is nothing that really says so. However, I personally like to headcanon the red heads as being descendants of the Uzumaki for the fun of it. Gaara would be either fourth or half Uzumaki by this conception, with Rasa (his father) being likely half, or possibly full. I’d say half because I don’t see him becoming Kazekage if he was a first generation immigrant is all (and he had Magnet Release, which isn’t Uzumaki, of course.) However, the fact that Gaara was able to handle the Shukaku could be used to imply his chakra was strong.
It’s a nice headcanon, and one I really like, but nothing in canon points to it.