Hello,
.
First point is number theory will be regarded as a chapter in only few book's where in other books it gets mixed with other chapters. So, the concepts included in number theory are

• primes
• composites
• multiples
• factor's
• number sequences
• number properties and
• rules for divisibility

.
You can practice the question based on these concepts. 2nd point there's no topic or chapter in the  syllabus that says  number theory is important, maybe you will get few questions regarding them. Here is the link where you will get the complete syllabus for the examination
https://school.careers360.com/articles/kvpy-syllabus

Hey there

Certain coaching institutes name this chapter and it is there in there material and thus you can look for them. Also you can watch NPTEL lectures on number theory of you really want to get deep knowledge. You can visit our e-learning platform it has various courses for engineering exams preparation

https://www.google.com/url?sa=t&source=web&rct=j&url=https://learn.careers360.com/&ved=2ahUKEwjw7Nn7hqnpAhV4wzgGHTnDBfgQFjAAegQIBhAD&usg=AOvVaw1ygKzacnBaQOPGaLiWbSgF

Good luck

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