It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 240 663 021 is not a prime number.
For example, 240 663 021 can be divided by 3: 240 663 021 / 3 = 80 221 007.
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For 240 663 021 to be a prime number, it would have been required that 240 663 021 has only two divisors, i.e., itself and 1.
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240 663 021 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 240 663 021 is about 15 513.318.
Thus, the square root of 240 663 021 is not an integer, and therefore 240 663 021 is not a square number.
The square of a number (here 240 663 021) is the result of the product of this number (240 663 021) by itself (i.e., 240 663 021 × 240 663 021); the square of 240 663 021 is sometimes called "raising 240 663 021 to the power 2", or "240 663 021 squared".
The square of 240 663 021 is 57 918 689 676 846 440 because 240 663 021 × 240 663 021 = 240 663 0212 = 57 918 689 676 846 440.
As a consequence, 240 663 021 is the square root of 57 918 689 676 846 440.
240 663 021 is a number with 9 digits.
The multiples of 240 663 021 are all integers evenly divisible by 240 663 021, that is all numbers such that the remainder of the division by 240 663 021 is zero. There are infinitely many multiples of 240 663 021. The smallest multiples of 240 663 021 are: