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Here we provide thousands of Question and their ANSWERS. Our question is helpful in ECAT, UPSC(IAS/IPS/IFS), ESE, EES, NTS FSc, BSc and all kinds of MATH/IQ TESTS.

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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