Prime or composite number

Belonging to natural numbers, prime and composite numbers differ in the number of divisors. Prime numbers have only two. Prime numbers are divisible without remainder only by themselves and by one.

There are quite a few such numbers, for example, in the first hundred (from 1 to 100) there are 25. However, there are prime numbers among larger numbers as well. Here is an example – 1327 – prime number? How to check? The calculator indicates the futility of searching for other divisors besides 1 and the number 1327.

Let's check 1337. Enter it in the appropriate field and press the button «Calculate». Online-the calculator indicates belonging «1337» to the group of composite numbers. Indeed, 1337 can be divided by 7 besides one and get 191 as a result.

There are tables of prime numbers, but instead you can use this online calculator for faster results. However, memorizing 25 values from the first hundred, like knowing the multiplication table, will positively affect the efficiency of completing school homework.

In complex mathematical calculations, the use of prime numbers allows to:
- successfully simplify fractions;
- find the LCM (largest common multiple);
- calculate the GCD (smallest common denominator) and more.