## Identify Prime and Composite Numbers

Some numbers, like (72), have actually many type of components. Other numbers, such as (7), have actually only two factors: (1) and also the number. A number through just two factors is called a **prime number**. A number through more than two components is called a **composite number**. The number (1) is neither prime nor composite. It has just one factor, itself.

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Definition: Prime Numbers and also Composite Numbers

A prime number is a counting number higher than (1) whose just determinants are (1) and itself.

A compowebsite number is a counting number that is not prime.

Figure (PageIndex5) lists the counting numbers from (2) via (20) together with their determinants. The highlighted numbers are prime, considering that each has actually only two determinants.

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Weeks after graduation Total variety of dollars Frank put in the account Simplified Total

0 | 100 | 100 |

1 | 100 + 15 | 115 |

2 | 100 + 15 • 2 | 130 |

3 | 100 + 15 • 3 | |

4 | 100 + 15 • <> | |

5 | 100 + <> | |

6 | ||

20 | ||

x |

**Banking**In March, Gina opened a Christmas club savings account at her financial institution. She deposited $75 to open up the account. Eincredibly week, she added $20 to the account. The table mirrors exactly how much money Gina had actually put in the account by the finish of each week. Complete the table by filling in the blanks. Weeks after opening the account Total variety of dollars Gina put in the account Simplified Total

0 | 75 | 75 |

1 | 75 + 20 | 95 |

2 | 75 + 20 • 2 | 115 |

3 | 75 + 20 • 3 | |

4 | 75 + 20 • <> | |

5 | 75 + <> | |

6 | ||

20 | ||

x |