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What is the smallest 2 digit number with only 2 factors?
It is 11 which is a prime number whose factors are itself and one
Why isn't 99 a prime number?
9 times 11 is 99. A prime is a number whose factors are one and itself.
What is a number between 12 and 40 that has three factors?
Square numbers have an odd number of factors. Other numbers have an even number of factors. The squares between 12 and 40 include 16, 25, and 36. If the number has only three factors, it must be the square of a prime number, since two of the factors will be 1 and itself, so if there is only one more factor, this third number cannot have factors itself. This means the number must be 25, whose factors are 1, 5, and 25. Response: 24 has (at least) three factors - 1, 2, 3, 4, 6, 8, 12, and 24 .
Write the number whose factors sum to 12?
The number is 6.
How do you know immediately that 2056 is not a prime number?
A prime number is a number whose only positive integer factors are itself and 1. Since 2056 ends in a 6, you know the number is divisible by 2 and therefore cannot possibly be prime.
