Were mammoths dinosaurs?

No, mammoths were not dinosaurs, they were prehistoric elephants. Dinosaurs were reptiles, they had scaly skins and they laid eggs and the bones of their bodies are arranged in a particular way that is distinctive of reptiles. Mammoths were mammals, like ourselves they had soft, furry skin and they gave birth to live babies and the earliest mammoths have been shown to have lived 62 million years after the very last dinosaurs.