Should I include the page numbers of a journal article in my reference list?

Yes, the page numbers at the end in the reference list entry, before the DOI:
Volume number(issue number), first page-last page.
Do not use p. or pp.

De Waal, F., & Sherblom, S. A. (2018). Bottom-up morality: The basis of human morality in our primate nature. Journal of Moral Education, 47(2), 248–258. https://doi.org/10.1080/03057240.2018.144070