These are some definitions and characteristics of scholarly articles.
Scholarly journals include articles that are reports and discussions of the results of original research, are written by those who carried out the studies, and are based on the results of their experiments or observations.
These articles are primary research articles.
Anatomy of a Scholarly Article (interactive graphic). NCSU Libraries
How to Read a Scientific Paper (pdf slides) Purdue University Libraries
A. Search for your journal title in Ulrich's International Periodicals Directory to see if it is scholarly/academic and refereed (peer-reviewed).
B. Use the Scholarly/Academic Journals limit within many databases
Most article databases allow you to limit your results to only scholarly/academic journals.
⇒ Use other methods to verify if some results seem wrong: this method does not always work well.
C. Check the journal's website
Search for the journals website. It will describe the purpose of the journal.
Look in the About This Journal section, or in the Instructions to Authors to see if the .journal is peer-reviewed,
Even if you have determined that the journal in which an article was published is scholarly, these journals usually also contain other types of articles such as editorials, commentary, review articles, book reviews, and news.
A. Clues you might find in the abstract include words such as:
study, results, methods/methodology, data, experimental, field trial
B. Look at the format of the article. Does it follow the typical format? (see previous tab)
From NCSU: https://www.lib.ncsu.edu/tutorials/scholarly-popular/