Table of Contents

## Can a irrational number be a prime number?

Prime numbers are by definition integers with certain special properties. An irrational number is not an integer, and so cannot be a prime number.

### Is every prime number a rational number?

Sal proves that the square root of any prime number must be an irrational number. For example, because of this proof we can quickly determine that √3, √5, √7, or √11 are irrational numbers.

**How do you prove that a number is irrational?**

The proof that √2 is indeed irrational is usually found in college level math texts, but it isn’t that difficult to follow. It does not rely on computers at all, but instead is a “proof by contradiction”: if √2 WERE a rational number, we’d get a contradiction….A proof that the square root of 2 is irrational.

2 | = | (2k)2/b2 |
---|---|---|

b2 | = | 2k2 |

**Do prime numbers have prime factors?**

A prime number is a counting number that only has two factors, itself and one. Counting numbers which have more than two factors (such as 6, whose factors are 1, 2, 3, and 6), are said to be composite numbers. The number 1 only has one factor and usually isn’t considered either prime or composite.

## Is 7.478478478 a rational number?

so its an irrational number.

### Do irrational numbers have common factors?

Hence they have a common factor of 2. However this contradicts the assumption that they have no common factors. This contradiction proves that c and b cannot both be integers, and thus the existence of a number that cannot be expressed as a ratio of two integers.

**Is the square root of a prime number rational or irrational?**

Now, the line of thought is to prove that is rational. However, we expect a contradiction such that we discard the assumption, and therefore claim that the original statement must be true, which in this case, the square root of a prime number is irrational.

**How many irrational numbers are there between two real numbers?**

Many square roots and cube roots numbers are also irrational, but not all of them. For example, √3 is an irrational number but √4 is a rational number. Because 4 is a perfect square, such as 4 = 2 x 2 and √4 = 2, which is a rational number. It should be noted that there are infinite irrational numbers between any two real numbers.

## What is the final product of two irrational numbers?

The addition or the multiplication of two irrational numbers may be rational; for example, √2. √2 = 2. Here, √2 is an irrational number. If it is multiplied twice, then the final product obtained is a rational number. (i.e) 2. The set of irrational numbers is not closed under the multiplication process, unlike the set of rational numbers.

### Are square roots and cube roots irrational numbers?

Many square roots and cube roots numbers are also irrational, but not all of them. For example, √3 is an irrational number but √4 is a rational number. Because 4 is a perfect square, such as 4 = 2 x 2 and √4 = 2, which is a rational number.