If you have access to adobe programs, files made in photoshop are pixel-based, and files made in Illustrator are vector based. If you’d like to check if something is a vector, you can usually tell if the file ends in .ap, .eps, or sometimes .pdf. Also, you could open the file in illustrator and press Ctrl+Y (Command+Y for mac) which only make the vector points visible. If you cannot get Adobe Illustrator, some alternatives are CorelDRAW, Affinity Designer, and Inkscape.