2, 3, 5, 7, 11, 13, 17, 19...

Where Prime Numbers mysteries are solved.

Here's a chart with all the numbers from 1-20:

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Number | Is it Prime? | Explanation |
---|---|---|

1 | No | 1 is neither prime nor composite. It's a special number. |

2 | Yes | 2 is divisible by itself and 1. |

3 | Yes | 3 is divisible by itself and 1. |

4 | No | 4 is divisible by 2, so it's not prime. |

5 | Yes | 5 is divisible by itself and 1. |

6 | No | 6 is divisible by 2 and 3, so it's not prime. |

7 | Yes | 7 is divisible by itself and 1. |

8 | No | 8 is divisible by 2, so it's not prime. |

9 | No | 9 is divisible by 3, so it's not prime. |

10 | No | 10 is divisible by 2 and 5, so it's not prime. |

11 | Yes | 11 is divisible by itself and 1. |

12 | No | 12 is divisible by 2 and 3, so it's not prime. |

13 | Yes | 13 is divisible by itself and 1. |

14 | No | 14 is divisible by 2 and 7, so it's not prime. |

15 | No | 15 is divisible by 3 and 5, so it's not prime. |

16 | No | 16 is divisible by 2, so it's not prime. |

17 | Yes | 17 is divisible by itself and 1. |

18 | No | 18 is divisible by 2 and 3, so it's not prime. |

19 | Yes | 19 is divisible by itself and 1. |

20 | No | 20 is divisible by 2 and 5, so it's not prime. |