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The difference between prime number and prime number
Prime numbers are also called prime numbers. In a natural number greater than 1, except for 1 and the integer itself, it cannot be divided by other natural numbers. In other words, natural numbers with only two positive factors (1 and itself) are prime numbers. Numbers larger than 1 but not prime numbers are called composite numbers. 1 and 0 are neither prime nor composite numbers. Composite numbers are obtained by multiplying several prime numbers. Therefore, prime numbers are the basis of composite numbers, There is no composite number without prime number. This also shows that the prime number mentioned above plays an important role in number theory. In history, 1 was also included in prime number, but later, for the sake of basic theorem of arithmetic, 1 was finally excluded from prime number by mathematicians. From the perspective of higher algebra, 1 is the unit element of multiplication, and it can not be included in prime number, All composite numbers can be obtained by multiplying several prime numbers
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