The work is devoted to the category of number in the Ukrainian language in a comparative-linguistic aspect with other Indo-European, Turkic and Sino-Tibetan languages. The purpose of the study is the comparative and analytical aspect of the number category in the Ukrainian, Turkish, German, and Chinese languages. The tasks of the work were to determine the comparative aspect of the number category in the German language compared to the Ukrainian language, to reveal the comparative aspect of the number category in the Turkish language compared to the Ukrainian language, to identify the definition of the comparative aspect of the number category in the Chinese language compared to the Ukrainian language. The object of the research is the number category in the Ukrainian, Turkish, German, and Chinese languages. The subject of the study is examples of singular and plural (singulus and plures) in Ukrainian, Turkish, German, and Chinese languages. The work uses comparative, historical, comparative and structural research methods. Scientific novelty is determined by the fact of the analysis of the category of the number of languages of different linguistic and historical groups. The theoretical and practical value of the obtained results lies in the application of the research material in working with foreign students for better and effective teaching of their Ukrainian language as a foreign language. The conclusions state that the number category is an interesting lexical-grammatical feature of language formation worthy of further research. When teaching students of foreign origin, it is advisable to take into account the complex grammar of their native language. The study of the category of number from the perspective of comparative linguistics provides a wide space for new research. Such studies have not only theoretical, but also practical/professional benefits for teachers of Ukrainian as a foreign language.