989is an odd number,as it is not divisible by 2
The factors for 989 are all the numbers between -989 and 989 , which divide 989 without leaving any remainder. Since 989 divided by -989 is an integer, -989 is a factor of 989 .
Since 989 divided by -989 is a whole number, -989 is a factor of 989
Since 989 divided by -43 is a whole number, -43 is a factor of 989
Since 989 divided by -23 is a whole number, -23 is a factor of 989
Since 989 divided by -1 is a whole number, -1 is a factor of 989
Multiples of 989 are all integers divisible by 989 , i.e. the remainder of the full division by 989 is zero. There are infinite multiples of 989. The smallest multiples of 989 are:
It is possible to determine using mathematical techniques whether an integer is prime or not.
for 989, the answer is: No, 989 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 989). 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 31.448 ). 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.
Previous prime number: 983
Next prime number: 991