1. Obliger is the party responsible for the debt - who is ultimately paying the interest? In this case, it's Memorial Health Services.
Many times, municipal bonds can be issued by parties other than state and local government bodies. These are generally "Revenue Bonds". Many times corporations working with local governments will be allowed to issue municipal bonds and getting favorable terms. Hospitals fall into this category. Universities also get this ability. Many times when issuing municipal bonds in this way, the "obliger" will go through a trustee umbrella entity/authority that is set up. Payments on the bonds will flow from the obliger, through the financing entity/authority, and then to the bondholder. An "Educational Financing Authority" entity may be set up in a particular state which many universities will issue their municipal bonds through. The obliger is the university, though the Educational Financing Authority will be labeled as the issuer. In this case it's "California Health Facilities Financing Authority" where the obliger is Memorial Health Services, a group of hospitals set up as a corporation.
If you're going to be digging in to municipal bonds, you need to start skimming through the official statements - similar to stock offering prospectus. Going through the first couple will seem like a lot of work. However, you'll soon get to the point of being able to quickly jump right to the sections of importance. They are all laid out in a similar format. Here is the one for this bond:
https://emma.msrb.org/ER587641-ER456791-ER859522.pdf
See Appendix A regarding specifics of the obliger.
2. No, this issue is not insured. Generally, if you look at the listing on your brokers screen, if it is insured there will be a flag indicating that. With Fidelity, it will show an "I" attribute on the summary line and on the details screen it will name the insurer. I know Etrade works similarly and I would assume Schwab does as well. Additionally, insured issues will generally name the insurer on the cover page of the official statement and show their logo.
Look at this official statement and the middle of the cover page naming Assured Guaranty Municipal as the insurer:
https://emma.msrb.org/EA606276-EA474356-EA870889.pdf