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能被2整除的数叫做偶数.一个大于1的正整数,若除了1与它本身外,再没有其他的正约数,这样的正整数叫做质数.在无数多个质数中,偶质数只有一个2.我们可以利用偶质数2的特点巧解
Numbers that can be divisible by 2 are called even numbers. A positive integer greater than 1 has no other positive divisors except 1 and itself. Such a positive integer is called a prime number. Among the infinite number of prime numbers, there is only one heterozygous number. 2. We can use the characteristics of the even number 2