Prime numbers

All prime numbers are odd numbers.

• True

• False

Answer explanation

There is only one even prime number...2!

There are ten prime numbers less than 30

• True

• False

Answer explanation

These are: 2, 3, 5, 7, 11, 13, 17, 19, 23, and 29

All prime numbers have exactly two factors.

• True

• False

Answer explanation

All prime numbers can be divided by themselves and 1. These are the two factors

If you add two prime numbers, it always makes an even number.

• True

• False

Answer explanation

2 + 3 = 5

Don't forget that 2 is a prime number!

Every number next to a multiple of 6 is a prime number

• True

• False

Answer explanation

48 is a multiple of 6, but 49 is not a prime number, because 7x7=49

Every two-digit prime number is next to a multiple of 6.

• True

• False

Answer explanation

Yeah, I checked. Weirdly enough, it's true.

Every two-digit multiple of 6 is next to a prime number.

• True

• False

There is only one two-digit prime number that starts with a 6_.

• True

• False

Answer explanation

There are two prime numbers in the 60's: 61 and 67

1 is not a prime number.

• True

• False

Answer explanation

Prime numbers have only two factors. The number 1 only has one factor - itself!

All two-digit prime numbers end in either _1, _3, _7, or _9

• True

• False

Answer explanation

It can't be an even number, and anything that ends in 5 can be divided by 5. This leaves just 1, 3, 7, and 9 as the possible last digits.