In addition we can say of the number 388 that it is even
388 is an even number, as it is divisible by 2 : 388/2 = 194
The factors for 388 are all the numbers between -388 and 388 , which divide 388 without leaving any remainder. Since 388 divided by -388 is an integer, -388 is a factor of 388 .
Since 388 divided by -388 is a whole number, -388 is a factor of 388
Since 388 divided by -194 is a whole number, -194 is a factor of 388
Since 388 divided by -97 is a whole number, -97 is a factor of 388
Since 388 divided by -4 is a whole number, -4 is a factor of 388
Since 388 divided by -2 is a whole number, -2 is a factor of 388
Since 388 divided by -1 is a whole number, -1 is a factor of 388
Multiples of 388 are all integers divisible by 388 , i.e. the remainder of the full division by 388 is zero. There are infinite multiples of 388. The smallest multiples of 388 are:
It is possible to determine using mathematical techniques whether an integer is prime or not.
for 388, the answer is: No, 388 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 388). 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 19.698 ). 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.
Previous prime number: 383
Next prime number: 389