It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 4 429 021 is not a prime number.
For example, 4 429 021 can be divided by 521: 4 429 021 / 521 = 8 501.
For 4 429 021 to be a prime number, it would have been required that 4 429 021 has only two divisors, i.e., itself and 1.
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4 429 021 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 4 429 021 is about 2 104.524.
Thus, the square root of 4 429 021 is not an integer, and therefore 4 429 021 is not a square number.
The square of a number (here 4 429 021) is the result of the product of this number (4 429 021) by itself (i.e., 4 429 021 × 4 429 021); the square of 4 429 021 is sometimes called "raising 4 429 021 to the power 2", or "4 429 021 squared".
The square of 4 429 021 is 19 616 227 018 441 because 4 429 021 × 4 429 021 = 4 429 0212 = 19 616 227 018 441.
As a consequence, 4 429 021 is the square root of 19 616 227 018 441.
The multiples of 4 429 021 are all integers evenly divisible by 4 429 021, that is all numbers such that the remainder of the division by 4 429 021 is zero. There are infinitely many multiples of 4 429 021. The smallest multiples of 4 429 021 are: