Oh, dude, a number with 4 factors would have to be the product of two distinct prime numbers. So, like, if you multiply two different prime numbers together, you'll get a number with 4 factors - 1, the number itself, and the two prime numbers you multiplied. Math can be pretty chill sometimes, right?
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A number with exactly 4 factors must be a square of a Prime number. This is because factors come in pairs when a number is not a perfect square, but when a number is a perfect square, one of the factors is repeated, resulting in an odd number of factors. Therefore, the number must be the square of a prime number, such as 4 (2^2) or 9 (3^2).
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.
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.
Factors of the number will also be factors of the number's multiples. Multiples of the number will also be multiples of the number's factors.
It means "to express a number or expression as a product of factors."
The factors of 4 are 1, 2, and 4. The only prime factor of 4 is 2. The factors of 20 are 1, 2, 4, 5, 10, and 20. The prime factors of 20 are 2x2x5.
4's factors are 2 X 2.
There is no such number. You can always find a number that has yet more factors. For example, 4 has three factors (1, 2, 4), 8 has four factors (1, 2, 4, 8), 16 has five factors (1, 2, 4, 8, 16), etc. - and you can continue obtaining higher and higher powers of two, thus obtaining numbers with more factors than the previous one.