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

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##### Answer

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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##### NUMBERING SYSTEM (MATH SHORTCUT TRICKS)

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##### NUMBERING SYSTEM QUESTION

Is zero even number or odd number (Even, Odd, Both, Neither even nor odd)...?
What is the lowest odd prime number (2, 3, -2, -3)...?
What are the consective prime number (2 and 3, 5 and 7, 11 and 13, all above)...?
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1 is prime or composite number (Prime, Composite, both, Neither Prime nor composite)..?
Give me numbers which are neither prime nor composite (0, 1, 0 and 1, None)?
All non prime number are also the composite number. (True or False)?
Which number neither prime nor composite (1, 29, 39, None)...?
What is the largest composite number less than 20 (17,18,19,20). ?
What is largest composite number less then 30 (23, 25, 28, 29)?
The number 4, 6, 8, 9, ... are (odd, even, prime, composite number) ...?
All even number greater then 2 are composite number (True, False)... ?
How many prime number are between 10 and 30 (5, 6, 7, 8)?
How many prime number are between 1 and 100 (25, 27, 29, 31)?
Which of the following is prime number (703,731,797,729)...?
##### MATH SHORTCUTS

Addition Shortcuts
Division Shortcuts