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**987is an odd number**,as it is not divisible by 2

The factors for 987 are all the numbers between -987 and 987 , which divide 987 without leaving any remainder. Since 987 divided by -987 is an integer, -987 is a factor of 987 .

Since 987 divided by -987 is a whole number, -987 is a factor of 987

Since 987 divided by -329 is a whole number, -329 is a factor of 987

Since 987 divided by -141 is a whole number, -141 is a factor of 987

Since 987 divided by -47 is a whole number, -47 is a factor of 987

Since 987 divided by -21 is a whole number, -21 is a factor of 987

Since 987 divided by -7 is a whole number, -7 is a factor of 987

Since 987 divided by -3 is a whole number, -3 is a factor of 987

Since 987 divided by -1 is a whole number, -1 is a factor of 987

Since 987 divided by 1 is a whole number, 1 is a factor of 987

Since 987 divided by 3 is a whole number, 3 is a factor of 987

Since 987 divided by 7 is a whole number, 7 is a factor of 987

Since 987 divided by 21 is a whole number, 21 is a factor of 987

Since 987 divided by 47 is a whole number, 47 is a factor of 987

Since 987 divided by 141 is a whole number, 141 is a factor of 987

Since 987 divided by 329 is a whole number, 329 is a factor of 987

Multiples of 987 are all integers divisible by 987 , i.e. the remainder of the full division by 987 is zero. There are infinite multiples of 987. The smallest multiples of 987 are:

0 : in fact, 0 is divisible by any integer, so it is also a multiple of 987 since 0 × 987 = 0

987 : in fact, 987 is a multiple of itself, since 987 is divisible by 987 (it was 987 / 987 = 1, so the rest of this division is zero)

etc.

It is possible to determine using mathematical techniques whether an integer is prime or not.

for 987, the answer is:
**No, 987 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 987). 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 31.417 ). 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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