¡¡¡¡1.Òò×Ó£ºfactor or divisor
¡¡¡¡If x and y are integers and x¡Ù0,x is a divisor (factor) of y provided that y=xn for some integer n. In this case y is also said to be divisible by x or to be a multiple of x. For example, 7 is a divisor or factor of 28 since 28=7•4, but 8 is not a divisor of 28 since there is no integer n such that 28=8n.Divisible adj.¿ÉÒÔ±»Õû³ýµÄ¡¡¡¡multiple¡¡n.±¶Êý
¡¡¡¡2.É̺ÍÓàÊý£ºquotients and remainders
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¡¡¡¡A prime number is a positive integer that has exactly two different positive divisors£¬1 and itself. For example, 2,3,5,7,11, and 13 are prime numbers, but 15 is not, since 15 has four different positive divisors, 1, 3, 5, and 15. The number 1 is not a prime number, since it has only one positive divisor. Every integer greater than 1 is either prime or can be uniquely expressed as a product of prime factors. For example, 14= (2) (7), 81= (3) (3) (3) (3), and 484= (2) (2) (11) (11).
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