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### How many prome number are between 1 and 100...?

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```    25
```
##### Explanation

What is a prime number?
A number is greater than 1 is called a prime number, if it has only two factors, 1 and the number itself.

According to the defination of prime number, the prime numbers between and 1 to 100 are: 2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89, 97. They are total 25.

###### Find a large number "A" is prime number or not (MATH PRIME NUMBER SHORTCUT TRICK By using Square Root method)

Therefore there are 25 prime number between 1 and 100.

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##### Prime Number

A number is greater than 1 is called a prime number, if it has only two factors, 1 and the number itself.

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##### SHORTCUT TRICKS (Division)
• Divisible by 2 Shortcut trick
• Divisible by 3 Shortcut trick
• Divisible by 4 Shortcut trick
• Divisible by 5 Shortcut trick
• Divisible by 6 Shortcut trick
• Divisible by 7 Shortcut trick
• Divisible by 8 Shortcut trick
• Divisible by 9 Shortcut trick
• Divisible by 10 Shortcut trick