It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 3 721 021 is not a prime number.
For example, 3 721 021 can be divided by 229: 3 721 021 / 229 = 16 249.
For 3 721 021 to be a prime number, it would have been required that 3 721 021 has only two divisors, i.e., itself and 1.
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3 721 021 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 3 721 021 is about 1 928.995.
Thus, the square root of 3 721 021 is not an integer, and therefore 3 721 021 is not a square number.
The square of a number (here 3 721 021) is the result of the product of this number (3 721 021) by itself (i.e., 3 721 021 × 3 721 021); the square of 3 721 021 is sometimes called "raising 3 721 021 to the power 2", or "3 721 021 squared".
The square of 3 721 021 is 13 845 997 282 441 because 3 721 021 × 3 721 021 = 3 721 0212 = 13 845 997 282 441.
As a consequence, 3 721 021 is the square root of 13 845 997 282 441.
The multiples of 3 721 021 are all integers evenly divisible by 3 721 021, that is all numbers such that the remainder of the division by 3 721 021 is zero. There are infinitely many multiples of 3 721 021. The smallest multiples of 3 721 021 are: