Prime numbers calculator checking, prime factorization of composite numbers into prime factors, online

Prime or composite number? Try factor it out below. Online calculator

Latest factored numbers

40 = 23 * 5Nov-27 14:51
24 = 23 * 3Nov-27 14:51
526 = 2 * 263Nov-27 14:51
98 = 2 * 72Nov-27 14:48
98 = 2 * 72Nov-27 14:47
90 = 2 * 32 * 5Nov-27 14:47
20 = 22 * 5Nov-27 14:47
7 234 = 2 * 3 617Nov-27 14:46
60 = 22 * 3 * 5Nov-27 14:45
45 = 32 * 5Nov-27 14:45
140 = 22 * 5 * 7Nov-27 14:44
320 = 26 * 5Nov-27 14:41
150 = 2 * 3 * 52Nov-27 14:41

Tutoring: prime numbers definition

Numbers that are only dividing by themselves and by number 1 are called prime numbers.

A composite number is a positive integer that has at least one positive divisor other than 1 and the number itself. A composite number is also any positive integer greater than 1 that is not a prime number.

  • 2 is divisible only by 2 and 1, so 2 is a prime number
  • 3 is divisible only by 3 and 1, so 3 is a prime number
  • 5 is divisible only by 5 and 1, so 5 is a prime number
  • 13 is divisible only by 13 and 1, so 13 is a prime number

1 is not considered prime, so the first prime number is 2 (prime numbers list is starting with the number 2)

Examples of prime numbers, up to 100: 2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89, 97

EUCLID (300 B.C.) proved that the set of prime numbers is infinite, with no largest prime number.