![]() ![]() The natural numbers that are evenly dividing only by 1 and themselves are called prime numbers.If the number 1 were considered a prime number, then the prime factorization of the number 15 could be written as: 15 = 3 × 5 OR 15 = 1 × 3 × 5 - these two representations would be considered different prime factorizations of the same number, so the theorem above would have no longer been valid.The number 1 is not considered prime, so the first prime number is 2. ![]() The fundamental theorem of arithmetic says that every integer larger than 1 can be written as a product of one or more prime numbers, in a way that is unique, except for the order of the prime factors.The Prime Factorization of a number: finding the prime numbers that multiply together to make that number. ![]()
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