Prime Numbers


Number system is a vast topic in Mathematics which contains both real and complex numbers. Complex numbers include both real and imaginary parts. In real numbers, these can be classified in rational and irrational numbers which can be further classified in Integers and Fractions. Rational numbers have form p / q, where 'q' must not be equals to zero. Rational numbers are always terminated or repeated (if not terminated).

Integer includes Whole numbers which includes all positive numbers between zero to infinity. Prime Numbers basically are part of Natural numbers and have only two factors. From one to infinity all integers are natural numbers. Zero is counted in whole numbers. Basically integers are combination of “negative numbers” and “whole numbers”. Whole numbers are further classified into “zero” and “Natural Numbers”.

Prime numbers can be divided by one and by the number itself. Prime numbers are not divisible by any other number. Now we will see what are prime numbers in detail.

There are some facts about prime numbers are given below:

·        Number “one” is neither considered in composite numbers nor in prime numbers.

·        “Two” is the only number which is prime number and even both.

·        “2” & “3” is the only pair that is prime and consecutive both.

·        Between “one” to “Hundred”, there are twenty five (25) numbers that are prime.

·        Natural numbers that are not prime numbers are composite numbers.

·        More general examples of Prime Numbers are 2, 3, 5, 7, 11, 13, 19, 23, 31, 33 etc.

·        4 = 2 * 2 * 1, thus 4 can’t be considered as prime number as it is divisible by 2 also irrespective of the two factors. 

Math Topics