It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 4 021 921 is not a prime number.
For example, 4 021 921 can be divided by 101: 4 021 921 / 101 = 39 821.
For 4 021 921 to be a prime number, it would have been required that 4 021 921 has only two divisors, i.e., itself and 1.
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4 021 921 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 4 021 921 is about 2 005.473.
Thus, the square root of 4 021 921 is not an integer, and therefore 4 021 921 is not a square number.
The square of a number (here 4 021 921) is the result of the product of this number (4 021 921) by itself (i.e., 4 021 921 × 4 021 921); the square of 4 021 921 is sometimes called "raising 4 021 921 to the power 2", or "4 021 921 squared".
The square of 4 021 921 is 16 175 848 530 241 because 4 021 921 × 4 021 921 = 4 021 9212 = 16 175 848 530 241.
As a consequence, 4 021 921 is the square root of 16 175 848 530 241.
The multiples of 4 021 921 are all integers evenly divisible by 4 021 921, that is all numbers such that the remainder of the division by 4 021 921 is zero. There are infinitely many multiples of 4 021 921. The smallest multiples of 4 021 921 are: