Factors are numbers which when multiplied together gives the result as the number of which they are factors of. Example, 2 & 3 are factors of 6 because when 2 & 3 are multiplied together, it gives 6. Another example, 3 & 7 are factors of 21 because 3 times 7 gives 21.
Number 1 is factor of every number. Why ? because every number when multiplied by 1 will give that number itself, so going by the definition, 1 is always factor of all the numbers.
Now coming back to prime numbers. Prime numbers are numbers, which have no factor other than 1 and itself. Example, what are factors of number 7 ? only 7 and 1, hence number 7 is a prime number. Another example, what are factors of number 13 ? only 13 and 1, hence number 13 is a prime number. To learn more about, find books on prime numbers
.Labels :what is a prime number, prime numbers, prime number list, sy sperling, prime number definition
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