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which of the following is a prime 21 29 32 35

Every real number is the product of prime numbers.

Prime numbers are useful when calculating:

1. LCM (least common multiple)

2. GCF (greatest common factor)

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Mar 21, 2011
Prime Numbers
by: Staff


The question:

which of the following is a prime 21 29 32 35


The answer:

A prime number is a positive integer (a natural number) which can only be divided evenly by two positive integers: 1 and itself.

Another way to look at a prime number is this: a prime number cannot be factored into more than two integers: the number 1 and itself.

The number 1 is not considered a prime number because it can only be divided evenly by a single number, the number 1. (A prime number can always be divided evenly by two different numbers, the number 1 and itself.)

The only even prime number is: 2

All other prime numbers are odd numbers (1, 3, 5 …).


Applying the definition of a prime number to your list yields the following results:

21 = 1 * 3 * 7, NOT a prime number

29 = 1 * 29, this is a PRIME NUMBER

32 = 1 * 2 * 2 * 2 * 2 * 2, NOT a prime number

35 = 1 * 7 * 5, NOT a prime number


The final answer to your question is: 29 is the only prime number on your list.


Here is a list of the first 20 prime numbers:

2 3 5 7 11 13 17 19 23 29 31 37 41 43 47 53 59 61 67 71


Prime number calculator (free):

http://www.math.com/students/calculators/source/prime-number.htm



Thanks for writing.


Staff
www.solving-math-problems.com



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