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42017is an odd number,as it is not divisible by 2
The factors for 42017 are all the numbers between -42017 and 42017 , which divide 42017 without leaving any remainder. Since 42017 divided by -42017 is an integer, -42017 is a factor of 42017 .
Since 42017 divided by -42017 is a whole number, -42017 is a factor of 42017
Since 42017 divided by -1 is a whole number, -1 is a factor of 42017
Since 42017 divided by 1 is a whole number, 1 is a factor of 42017
Multiples of 42017 are all integers divisible by 42017 , i.e. the remainder of the full division by 42017 is zero. There are infinite multiples of 42017. The smallest multiples of 42017 are:
0 : in fact, 0 is divisible by any integer, so it is also a multiple of 42017 since 0 × 42017 = 0
42017 : in fact, 42017 is a multiple of itself, since 42017 is divisible by 42017 (it was 42017 / 42017 = 1, so the rest of this division is zero)
84034: in fact, 84034 = 42017 × 2
126051: in fact, 126051 = 42017 × 3
168068: in fact, 168068 = 42017 × 4
210085: in fact, 210085 = 42017 × 5
etc.
It is possible to determine using mathematical techniques whether an integer is prime or not.
for 42017, the answer is: yes, 42017 is a prime number because it only has two different divisors: 1 and itself (42017).
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 42017). 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 204.98 ). 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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