The list of all positive divisors (that is, the list of all integers that divide 22) is as follows :
Accordingly:
1988 is multiplo of 1
1988 is multiplo of 2
1988 is multiplo of 4
1988 is multiplo of 7
1988 is multiplo of 14
1988 is multiplo of 28
1988 is multiplo of 71
1988 is multiplo of 142
1988 is multiplo of 284
1988 is multiplo of 497
1988 is multiplo of 994
1988 has 11 positive divisors
In addition we can say of the number 1988 that it is even
1988 is an even number, as it is divisible by 2 : 1988/2 = 994
The factors for 1988 are all the numbers between -1988 and 1988 , which divide 1988 without leaving any remainder. Since 1988 divided by -1988 is an integer, -1988 is a factor of 1988 .
Since 1988 divided by -1988 is a whole number, -1988 is a factor of 1988
Since 1988 divided by -994 is a whole number, -994 is a factor of 1988
Since 1988 divided by -497 is a whole number, -497 is a factor of 1988
Since 1988 divided by -284 is a whole number, -284 is a factor of 1988
Since 1988 divided by -142 is a whole number, -142 is a factor of 1988
Since 1988 divided by -71 is a whole number, -71 is a factor of 1988
Since 1988 divided by -28 is a whole number, -28 is a factor of 1988
Since 1988 divided by -14 is a whole number, -14 is a factor of 1988
Since 1988 divided by -7 is a whole number, -7 is a factor of 1988
Since 1988 divided by -4 is a whole number, -4 is a factor of 1988
Since 1988 divided by -2 is a whole number, -2 is a factor of 1988
Since 1988 divided by -1 is a whole number, -1 is a factor of 1988
Since 1988 divided by 1 is a whole number, 1 is a factor of 1988
Since 1988 divided by 2 is a whole number, 2 is a factor of 1988
Since 1988 divided by 4 is a whole number, 4 is a factor of 1988
Since 1988 divided by 7 is a whole number, 7 is a factor of 1988
Since 1988 divided by 14 is a whole number, 14 is a factor of 1988
Since 1988 divided by 28 is a whole number, 28 is a factor of 1988
Since 1988 divided by 71 is a whole number, 71 is a factor of 1988
Since 1988 divided by 142 is a whole number, 142 is a factor of 1988
Since 1988 divided by 284 is a whole number, 284 is a factor of 1988
Since 1988 divided by 497 is a whole number, 497 is a factor of 1988
Since 1988 divided by 994 is a whole number, 994 is a factor of 1988
Multiples of 1988 are all integers divisible by 1988 , i.e. the remainder of the full division by 1988 is zero. There are infinite multiples of 1988. The smallest multiples of 1988 are:
0 : in fact, 0 is divisible by any integer, so it is also a multiple of 1988 since 0 × 1988 = 0
1988 : in fact, 1988 is a multiple of itself, since 1988 is divisible by 1988 (it was 1988 / 1988 = 1, so the rest of this division is zero)
3976: in fact, 3976 = 1988 × 2
5964: in fact, 5964 = 1988 × 3
7952: in fact, 7952 = 1988 × 4
9940: in fact, 9940 = 1988 × 5
etc.
It is possible to determine using mathematical techniques whether an integer is prime or not.
for 1988, the answer is: No, 1988 is not a prime number.
To know the primality of an integer, we can use several algorithms. The most naive is to try all divisors below the number you want to know if it is prime (in our case 1988). We can already eliminate even numbers bigger than 2 (then 4 , 6 , 8 ...). Besides, we can stop at the square root of the number in question (here 44.587 ). Historically, the Eratosthenes screen (which dates back to Antiquity) uses this technique relatively effectively.
More modern techniques include the Atkin screen, probabilistic tests, or the cyclotomic test.
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