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In addition we can say of the number **670 that it is even**

670 is an even number, as it is divisible by 2 : 670/2 = 335

The factors for 670 are all the numbers between -670 and 670 , which divide 670 without leaving any remainder. Since 670 divided by -670 is an integer, -670 is a factor of 670 .

Since 670 divided by -670 is a whole number, -670 is a factor of 670

Since 670 divided by -335 is a whole number, -335 is a factor of 670

Since 670 divided by -134 is a whole number, -134 is a factor of 670

Since 670 divided by -67 is a whole number, -67 is a factor of 670

Since 670 divided by -10 is a whole number, -10 is a factor of 670

Since 670 divided by -5 is a whole number, -5 is a factor of 670

Since 670 divided by -2 is a whole number, -2 is a factor of 670

Since 670 divided by -1 is a whole number, -1 is a factor of 670

Since 670 divided by 1 is a whole number, 1 is a factor of 670

Since 670 divided by 2 is a whole number, 2 is a factor of 670

Since 670 divided by 5 is a whole number, 5 is a factor of 670

Since 670 divided by 10 is a whole number, 10 is a factor of 670

Since 670 divided by 67 is a whole number, 67 is a factor of 670

Since 670 divided by 134 is a whole number, 134 is a factor of 670

Since 670 divided by 335 is a whole number, 335 is a factor of 670

Multiples of 670 are all integers divisible by 670 , i.e. the remainder of the full division by 670 is zero. There are infinite multiples of 670. The smallest multiples of 670 are:

0 : in fact, 0 is divisible by any integer, so it is also a multiple of 670 since 0 × 670 = 0

670 : in fact, 670 is a multiple of itself, since 670 is divisible by 670 (it was 670 / 670 = 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 670, the answer is:
**No, 670 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 670). 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 25.884 ). 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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