Novelty of a research paper
The goal of a research paper is to advance the knowledge of the field. There is no goal that every known fact be documented in scientific literature. So, you need to ask yourself whether your work truly contributes to the body of knowledge. If unsure, ask a supervisor, colleague or the editor of the journal you would consider submitting to.

Besides advancing the state of knowledge there is also the question of whether the contribution is significant. If others can arrive at the same conclusion with minimal work, journals (especially more reputed ones) may reject your paper because it is not significant enough.