It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 240 809 is not a prime number.
For example, 240 809 can be divided by 257: 240 809 / 257 = 937.
For 240 809 to be a prime number, it would have been required that 240 809 has only two divisors, i.e., itself and 1.
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240 809 is an odd number, because it is not evenly divisible by 2.
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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 240 809 is about 490.723.
Thus, the square root of 240 809 is not an integer, and therefore 240 809 is not a square number.
The square of a number (here 240 809) is the result of the product of this number (240 809) by itself (i.e., 240 809 × 240 809); the square of 240 809 is sometimes called "raising 240 809 to the power 2", or "240 809 squared".
The square of 240 809 is 57 988 974 481 because 240 809 × 240 809 = 240 8092 = 57 988 974 481.
As a consequence, 240 809 is the square root of 57 988 974 481.
The multiples of 240 809 are all integers evenly divisible by 240 809, that is all numbers such that the remainder of the division by 240 809 is zero. There are infinitely many multiples of 240 809. The smallest multiples of 240 809 are: