A prime number is a natural number divisor is only 1 and itself. The number has more than 2 divisor are called composite. Because the No. 1 has only one divisor is itself, so the number 1 is not a prime number, and also is not composite. Number 2 is the smallest prime number, and also is the only even prime number.
đang được dịch, vui lòng đợi..
![](//viimg.ilovetranslation.com/pic/loading_3.gif?v=b9814dd30c1d7c59_8619)