Not sure if your article is peer reviewed? Look for these clues:
Author. The author's credentials & institution should be listed. Authors of peer reviewed articles typically have graduate degrees and are a faculty member at a university.
Abstract. Many peer reviewed articles begin with an abstract, which is a paragraph summarizing the research.
Audience. Peer reviewed articles are written for scholars, researchers, & students who are knowledgeable about the topic, and likely use specialized terminology.
Purpose. What is the purpose of the article? Does the author want to support findings of a research project, present a case study, make an argument that is supported by evidence or research, etc.?
References. Peer reviewed articles typically include a bibliography that cites other peer reviewed sources.
Publication venue. Peer reviewed articles are published in academic journals. To find out if a journal is peer reviewed, visit the publisher's website to find information about their review policy. Google the journal title and look in the Knowledge Panel (on the right side of the results screen) for information about the journal.