120899is an odd number,as it is not divisible by 2
The factors for 120899 are all the numbers between -120899 and 120899 , which divide 120899 without leaving any remainder. Since 120899 divided by -120899 is an integer, -120899 is a factor of 120899 .
Since 120899 divided by -120899 is a whole number, -120899 is a factor of 120899
Since 120899 divided by -1 is a whole number, -1 is a factor of 120899
Since 120899 divided by 1 is a whole number, 1 is a factor of 120899
Multiples of 120899 are all integers divisible by 120899 , i.e. the remainder of the full division by 120899 is zero. There are infinite multiples of 120899. The smallest multiples of 120899 are:
0 : in fact, 0 is divisible by any integer, so it is also a multiple of 120899 since 0 × 120899 = 0
120899 : in fact, 120899 is a multiple of itself, since 120899 is divisible by 120899 (it was 120899 / 120899 = 1, so the rest of this division is zero)
241798: in fact, 241798 = 120899 × 2
362697: in fact, 362697 = 120899 × 3
483596: in fact, 483596 = 120899 × 4
604495: in fact, 604495 = 120899 × 5
etc.
It is possible to determine using mathematical techniques whether an integer is prime or not.
for 120899, the answer is: yes, 120899 is a prime number because it only has two different divisors: 1 and itself (120899).
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 120899). 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 347.705 ). 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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