Q: Why isn't 667 a prime number?

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39 is not a prime number because it has four factors: 1,3,13,39 and because prime number are numbers who has 2 factors.

23*29=667

No, 2001 can be factored. (3 * 667)

Infinity is not a number. It cannot be graphed nor placed onto a number line. Infinity is an idea, a prospect. So the answer is "none" since Infinity isnt a number.

It isn't clear what you mean with "looks like prime". What would your criteria be to "look like a prime"? The first prime numbers are:2, 3, 5, 7, 11, 13, 17, 23, 29, 31 ...Other positive integers (larger than 1) are composite numbers. The number 1 has a special role, as the identity element of multiplication. It is neither a prime number nor a composite number.

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1, 23, 29, 667

No, it is composite as 667 = 23 x 29

It is 29 because 29*23 = 667

Composite

667

Composite

Because it has 23 and 29 as factors.

The prime factors of 667 are 29 and 23. 29*23=667.

No. It has more than two factors.

23 x 29= 667

The factors of 667 are: 1 23 29 667.The prime factors are: 23, 29

39 is not a prime number because it has four factors: 1,3,13,39 and because prime number are numbers who has 2 factors.