It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 240 206 is not a prime number.
For example, 240 206 can be divided by 2: 240 206 / 2 = 120 103.
For 240 206 to be a prime number, it would have been required that 240 206 has only two divisors, i.e., itself and 1.
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240 206 is an even number, because it is evenly divisible by 2: 240 206 / 2 = 120 103.
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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 240 206 is about 490.108.
Thus, the square root of 240 206 is not an integer, and therefore 240 206 is not a square number.
The square of a number (here 240 206) is the result of the product of this number (240 206) by itself (i.e., 240 206 × 240 206); the square of 240 206 is sometimes called "raising 240 206 to the power 2", or "240 206 squared".
The square of 240 206 is 57 698 922 436 because 240 206 × 240 206 = 240 2062 = 57 698 922 436.
As a consequence, 240 206 is the square root of 57 698 922 436.
The multiples of 240 206 are all integers evenly divisible by 240 206, that is all numbers such that the remainder of the division by 240 206 is zero. There are infinitely many multiples of 240 206. The smallest multiples of 240 206 are: