It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 28 009 is not a prime number.
For example, 28 009 can be divided by 37: 28 009 / 37 = 757.
For 28 009 to be a prime number, it would have been required that 28 009 has only two divisors, i.e., itself and 1.
Find out more:
28 009 is an odd number, because it is not evenly divisible by 2.
Find out more:
A number is a perfect square (or a square number) if its square root is an integer; that is to say, it is the product of an integer with itself. Here, the square root of 28 009 is about 167.359.
Thus, the square root of 28 009 is not an integer, and therefore 28 009 is not a square number.
The square of a number (here 28 009) is the result of the product of this number (28 009) by itself (i.e., 28 009 × 28 009); the square of 28 009 is sometimes called "raising 28 009 to the power 2", or "28 009 squared".
The square of 28 009 is 784 504 081 because 28 009 × 28 009 = 28 0092 = 784 504 081.
As a consequence, 28 009 is the square root of 784 504 081.
The multiples of 28 009 are all integers evenly divisible by 28 009, that is all numbers such that the remainder of the division by 28 009 is zero. There are infinitely many multiples of 28 009. The smallest multiples of 28 009 are: