Q: Why is 155 not a prime number?

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155 is not a prime number, but a composite number, as it is divisible by 5 and 31.

155 is not a prime number, so it can't be a prime factor.

As 155 is ending with 5 then it can be divided by 5 thus it's not a prime number 155 = 5 x 31

It is: 5*31 = 155

A prime number is a number that is evenly divisible only by itself or 1.155 can be evenly divided by 5 (155/5=31), so is not a prime number.

155 is a composite number. Its factors are 1, 5, 31, and 155.

not prime, since it is divideable by 5, and 31.

A prime number has only 2 factors which are 1 and itself. Composite numbers are everything else except 1 and 0. 1 and 0 are neither prime, nor composite. 155 is composite.

155 five is composite. It is composite because it has 5 as a factor. The only number that can be neither prime nor composite is 1.

The prime factorization of 155 is 5 * 315x31

155 is not a prime number, hint: Any number ending in a 5 is divisible by 5.155 is a composite number

Prime factors of 155 are 5 and 31