What number has 4 factors?

Answer 1

No, because 4 is not a factor of 14, for example.The rule for finding if a number is a multiple of 4 is: If the last 2 digits of the number are a multiple of 4, then the number is a multiple of 4.

Example: here are some multiples of 4: 4, 8, 12, 16, 20, 24, 28, 32, 36, 40, 44, 48, 52, 56, 60, 64, 68, 72, 76, 80, 84, 88, 92, 96, 100

so if the last 2 digits of the number are 04, 08, 16, ...., 96, or 00, then the number is a multiple of 4 (or you can say that 4 is a factor)

234535721117575672 has 4 as a factor, because 72 are the last 2 digits.

Rather than memorize all multiples of 4 to 100, just remember this:

if the 'ones' digit is a 0, 4, or 8, then the 'tens' digit must be even (zero being even): example, 20, 48, 64

if the 'ones' digit is a 2 or 6, then the 'tens' digit must be odd.

example 16, 52, 36
No. 4 and 24 have a factor of 4, but 14 and 34 do not.

Answer 2

Any number in the 4 times table: 4, 8, 12, 16, 20, ...

There are two easy tests to see if a number has 4 as a factor (ie is divisible by 4, or, put another way, is a multiple of 4):

1) The last 2 digits of the number is a multiple of 4.

2) If the sum of the last (ones) digit plus twice the tens digit is a multiple of 4, then so is the original number.

The second test can be repeated on the sum; so if the summing is repeated until a single digit remains, then the number has 4 as a factor only if this single digit is 4 or 8.

Answer 3

6

Answer 4

No.