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### Which number is prime number ...? ____________________________________

```    None
```
##### Explanation

This question is about "Which number is prime number". Let us see defination of "Prime Number" again

```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 i.e 2, 3, 5, 7, 11 ... also notice that prime number are start form 2.

```1
```

1 has only one positive divisor that is itself. therefore 1 is not a prime number.

```39
```

39 has following positive divisor.
1, 3, 13 and 39. we have check this divisible by 3 math shortcut trick.

```49
```

49 has following positive divisor.
1, 7, 49. It is very simple that 49 is divisble by 7. we can also check it by divisible by 7 math shortcut trick.

Therefore 1, 7, 49 are not prime number. None of above is prime number.

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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

##### Worksheets (Solved)

###### Integration     