157is an odd number,as it is not divisible by 2
The factors for 157 are all the numbers between -157 and 157 , which divide 157 without leaving any remainder. Since 157 divided by -157 is an integer, -157 is a factor of 157 .
Since 157 divided by -157 is a whole number, -157 is a factor of 157
Since 157 divided by -1 is a whole number, -1 is a factor of 157
Multiples of 157 are all integers divisible by 157 , i.e. the remainder of the full division by 157 is zero. There are infinite multiples of 157. The smallest multiples of 157 are:
It is possible to determine using mathematical techniques whether an integer is prime or not.
for 157, the answer is: yes, 157 is a prime number because it only has two different divisors: 1 and itself (157).
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 157). 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 12.53 ). 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: 151
Next prime number: 163