No, ultralights are single seat to protect members of the public:

"For example, the assumption can be made that a person who elects, without pilot qualifications, to operate an uncertificated vehicle alone is fully aware of the risks involved. This assumption does not hold true of a passenger selected randomly from the general public. Persons in the general public will likely assume that the operator has certificated pilot qualifications."

Also, not all airports allow ultralight operations.

https://www.usua.org/Rules/faa103.htm

Also, for insurance and legal reasons, no professional CFI is going to endorse you as a student pilot on an on-going basis.