Table of Contents

## What is the smallest number having 3 different prime factors?

The three smallest prime numbers are 2, 3, & 5. When we multiply 2*3*5 weget 30. Answer: 30 is the smallest number that has three different prime factors. Q3.

### What are the prime numbers divisible by 3?

If you don’t get a whole number, next try dividing it by prime numbers: 3, 5, 7, 11 (9 is divisible by 3) and so on, always dividing by a prime number (see table below).

**What is a prime number with 3 factors called?**

As it turns out, the only positive integers with exactly three factors are the squares of primes. For instance, the factors of 9 are 1, 3, and 9, and the factors of 49 are 1, 7, and 49.

**What are the first 3 prime numbers?**

The first five prime numbers: 2, 3, 5, 7 and 11. A prime number is an integer, or whole number, that has only two factors — 1 and itself.

## Which is the smallest number having different prime factors?

2 × 3 × 5 × 7 = 210. So, 210 is the smallest number having four different prime factors.

### What is the divisible by 3?

If the sum of the digits of a number is divisible by 3, then the number is divisible by 3. Some examples of numbers divisible by 3 are as follows. The number 85203 is divisible by 3 because the sum of its digits 8+5+2+0+3=18 is divisible by 3.

**What is the least prime number?**

2

2 is the smallest prime number. It also the only even prime number – all other even numbers can be divided by themselves, 1 and 2 at least, meaning they will have at least 3 factors.

**What are positive prime numbers?**

Prime numbers are the positive integers having only two factors, 1 and the integer itself….Twin Prime Numbers

- (5, 7) [7 – 5 = 2]
- (11, 13) [13 – 11 = 2]
- (17, 19) [19 – 17 = 2]
- (29, 31) [31 – 29 = 2]
- (41, 43) [43 – 41 = 2]
- (59, 61) [61 – 59 = 2]
- (71, 73) [73 – 71 = 2]

## Is a multiple of the prime number 3 also a prime number?

Explanation: A multiple of the prime number 3 is not also a prime number because since it is a multiple, it is something like 3 × n for any number n . For example, 6 is a multiple of 3 and it is composite, not prime. Also, 9 is 3 × 3 and it is not prime.

### Can negative numbers be prime?

Answer One: No. By the usual definition of prime for integers, negative integers can not be prime. By this definition, primes are integers greater than one with no positive divisors besides one and itself. Negative numbers are excluded.

**Why is 2 not a prime number?**

Proof: The definition of a prime number is a positive integer that has exactly two distinct divisors. Since the divisors of 2 are 1 and 2, there are exactly two distinct divisors, so 2 is prime. Rebuttal: Because even numbers are composite, 2 is not a prime.

**What is the least positive whole number divisible by four different prime numbers?**

210

Answer: 210 is the smallest number having four different prime factors.