Divisibility Rules Factors Prime and Composite Numbers

what is the divisibility rule for 4

• Last two numbers divisible by 4

• Last 3 numbers divisible by 4

• Add all of the digits and divide by 4

• Even number

Which number is divisible by 6

• 1782

• 1213

• 536

Which number is divisible by 4 and 8

• 6657

• 7990

• 554672

Which of the following is NOT true about prime numbers? 

• They have exactly two factors 

• 1 is a factor of every prime number

• No prime numbers end in zero

• All prime numbers are odd numbers.  

Which number is NOT prime?

• 3

• 7

• 17

• 21

Are each of these numbers prime or composite?

• composite

• 7

• prime

• 3

• composite

• 12

• prime

• 10

• composite

• 15

The number ​ (a)   is the only even prime number because it has ​ (b)  

• 2

• 4

• 1

• exactly two factors

• more than 2 factors

• exactly 1 factor

The number 11 is​ (a)   because it has ​ (b)  

• prime

• composite

• exactly 2 factors

• more than 2 factors

True/False The number 1 is neither prime nor composite.

• True

• False

Composite numbers:

• Are always bigger than prime numbers

• Have more than 2 factors

• Have 2 pairs of factors

• Don't have factors