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2（二）是1与3之间的自然数，2是唯一的偶數質數 （又稱偶素數）。
偶数
如果一个整数能被2整除，就叫做偶数。反過來說，任何數乘以2即為偶數。对于用偶数进制书写的整数，例如十進制和十六進制，要判断它...