Prime and composite numbers

 

Decomposing a number into its prime numbers:

The relation of divisibility

 

Multiples and Divisors of a number:

Divisibility Criteria:

Divisibility by Number	Divisibility Rule
Divisibility by 2	The last digit should be even.
Divisibility by 3	The sum of the digits should be divisible by 3.
Divisibility by 5	The last digit should either be 0 or 5.
Divisibility by 9	The sum of the digits should be divisible by 9.
Divisibility by 11	The difference of the alternating sum of digits should be divisible by 11.

The set of natural numbers

 

The decimal numeral system

If more information is required you could find it in following link.

The sexagesimal system