Is a sperm cell an individual organism?

I'd like to add a bit of information to this question in order to better answer it. I believe that the question is (or should be) asking if a sperm cell is an individual living organism. If that is the question, then the answer is "no."
There are characteristics of life that any living organism must have. Depending on the source, the list is anywhere from 5-10 things; however, the count difference is generally because of how a characteristic might be divided up into sub-categories. I teach 6 characteristics of life that all living things share.
Living things are made of at least one cell.
Living things have DNA.
Living things grow and develop.
Living things respond to their environment.
Living things can reproduce.
Living things obtain and use energy.
Sperm cells do have many of those characteristics; however, sperm cells are not capable of reproducing. They do not undergo binary fission or mitosis like other single-celled organisms do. Sperm cells are integral to sexual reproduction, but sexual reproduction with sperm cells doesn't produce more single-celled sperm or egg cells. Eventually, it produces the organism that produced the gamete in the first place. Sperm cells are also not able to grow and develop. They age, but they do not go through any kind of growth, nor are there developmental stages that they move through. An individual living organism must have all 6 characteristics; therefore, sperm cells are not individual living organisms.