Number theory is a branch of mathematics that studies the properties and relationships of numbers, particularly integers.
Divisibility is the property of a number being able to be divided by another number without leaving a remainder.
A divisibility question is a question that asks whether a given number is divisible by another number without leaving a remainder.
In number theory, divisibility is tested using division and checking for a remainder. If the remainder is 0, then the numbers are divisible.
Divisibility is an important concept in number theory as it helps identify patterns and relationships between numbers. It is also used in various mathematical proofs and has practical applications in fields such as cryptography and coding theory.