It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 21 015 018 is not a prime number.
For example, 21 015 018 can be divided by 2: 21 015 018 / 2 = 10 507 509.
For 21 015 018 to be a prime number, it would have been required that 21 015 018 has only two divisors, i.e., itself and 1.
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21 015 018 is an even number, because it is evenly divisible by 2: 21 015 018 / 2 = 10 507 509.
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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 21 015 018 is about 4 584.214.
Thus, the square root of 21 015 018 is not an integer, and therefore 21 015 018 is not a square number.
The square of a number (here 21 015 018) is the result of the product of this number (21 015 018) by itself (i.e., 21 015 018 × 21 015 018); the square of 21 015 018 is sometimes called "raising 21 015 018 to the power 2", or "21 015 018 squared".
The square of 21 015 018 is 441 630 981 540 324 because 21 015 018 × 21 015 018 = 21 015 0182 = 441 630 981 540 324.
As a consequence, 21 015 018 is the square root of 441 630 981 540 324.
21 015 018 is a number with 8 digits.
The multiples of 21 015 018 are all integers evenly divisible by 21 015 018, that is all numbers such that the remainder of the division by 21 015 018 is zero. There are infinitely many multiples of 21 015 018. The smallest multiples of 21 015 018 are: