It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 4 020 109 is not a prime number.
For example, 4 020 109 can be divided by 17: 4 020 109 / 17 = 236 477.
For 4 020 109 to be a prime number, it would have been required that 4 020 109 has only two divisors, i.e., itself and 1.
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4 020 109 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 4 020 109 is about 2 005.021.
Thus, the square root of 4 020 109 is not an integer, and therefore 4 020 109 is not a square number.
The square of a number (here 4 020 109) is the result of the product of this number (4 020 109) by itself (i.e., 4 020 109 × 4 020 109); the square of 4 020 109 is sometimes called "raising 4 020 109 to the power 2", or "4 020 109 squared".
The square of 4 020 109 is 16 161 276 371 881 because 4 020 109 × 4 020 109 = 4 020 1092 = 16 161 276 371 881.
As a consequence, 4 020 109 is the square root of 16 161 276 371 881.
The multiples of 4 020 109 are all integers evenly divisible by 4 020 109, that is all numbers such that the remainder of the division by 4 020 109 is zero. There are infinitely many multiples of 4 020 109. The smallest multiples of 4 020 109 are: