139is an odd number,as it is not divisible by 2
The factors for 139 are all the numbers between -139 and 139 , which divide 139 without leaving any remainder. Since 139 divided by -139 is an integer, -139 is a factor of 139 .
Since 139 divided by -139 is a whole number, -139 is a factor of 139
Since 139 divided by -1 is a whole number, -1 is a factor of 139
Since 139 divided by 1 is a whole number, 1 is a factor of 139
Multiples of 139 are all integers divisible by 139 , i.e. the remainder of the full division by 139 is zero. There are infinite multiples of 139. The smallest multiples of 139 are:
0 : in fact, 0 is divisible by any integer, so it is also a multiple of 139 since 0 × 139 = 0
139 : in fact, 139 is a multiple of itself, since 139 is divisible by 139 (it was 139 / 139 = 1, so the rest of this division is zero)
It is possible to determine using mathematical techniques whether an integer is prime or not.
for 139, the answer is: yes, 139 is a prime number because it only has two different divisors: 1 and itself (139).
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 139). 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 11.79 ). 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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