Is 190 a prime number?
It is possible to find out using mathematical methods whether a given integer is a prime number or not.
For 190, the answer is: No, 190 is not a prime number.
The list of all positive divisors (i.e., the list of all integers that divide 190) is as follows: 1, 2, 5, 10, 19, 38, 95, 190.
For 190 to be a prime number, it would have been required that 190 has only two divisors, i.e., itself and 1.
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Actually, one can immediately see that 190 cannot be prime, because 5 is one of its divisors: indeed, a number ending with 0 or 5 has necessarily 5 among its divisors. The last digit of 190 is 0, so it is divisible by 5 and is therefore not prime.
As a consequence:
- 190 is a multiple of 1
- 190 is a multiple of 2
- 190 is a multiple of 5
- 190 is a multiple of 10
- 190 is a multiple of 19
- 190 is a multiple of 38
- 190 is a multiple of 95
For 190 to be a prime number, it would have been required that 190 has only two divisors, i.e., itself and 1.
Is 190 a deficient number?
Yes, 190 is a deficient number, that is to say 190 is a natural number that is strictly larger than the sum of its proper divisors, i.e., the divisors of 190 without 190 itself (that is 1 + 2 + 5 + 10 + 19 + 38 + 95 = 170).