The list of all positive divisors (that is, the list of all integers that divide 22) is as follows :
402 is multiplo of 1
402 is multiplo of 2
402 is multiplo of 3
402 is multiplo of 6
402 is multiplo of 67
402 is multiplo of 134
402 is multiplo of 201
402 has 7 positive divisors
In addition we can say of the number 402 that it is even
402 is an even number, as it is divisible by 2 : 402/2 = 201
The factors for 402 are all the numbers between -402 and 402 , which divide 402 without leaving any remainder. Since 402 divided by -402 is an integer, -402 is a factor of 402 .
Since 402 divided by -402 is a whole number, -402 is a factor of 402
Since 402 divided by -201 is a whole number, -201 is a factor of 402
Since 402 divided by -134 is a whole number, -134 is a factor of 402
Since 402 divided by -67 is a whole number, -67 is a factor of 402
Since 402 divided by -6 is a whole number, -6 is a factor of 402
Since 402 divided by -3 is a whole number, -3 is a factor of 402
Since 402 divided by -2 is a whole number, -2 is a factor of 402
Since 402 divided by -1 is a whole number, -1 is a factor of 402
Multiples of 402 are all integers divisible by 402 , i.e. the remainder of the full division by 402 is zero. There are infinite multiples of 402. The smallest multiples of 402 are:
It is possible to determine using mathematical techniques whether an integer is prime or not.
for 402, the answer is: No, 402 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 402). 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 20.05 ). 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: 401
Next prime number: 409