It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 2 016 649 is not a prime number.
For example, 2 016 649 can be divided by 431: 2 016 649 / 431 = 4 679.
For 2 016 649 to be a prime number, it would have been required that 2 016 649 has only two divisors, i.e., itself and 1.
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2 016 649 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 2 016 649 is about 1 420.088.
Thus, the square root of 2 016 649 is not an integer, and therefore 2 016 649 is not a square number.
The square of a number (here 2 016 649) is the result of the product of this number (2 016 649) by itself (i.e., 2 016 649 × 2 016 649); the square of 2 016 649 is sometimes called "raising 2 016 649 to the power 2", or "2 016 649 squared".
The square of 2 016 649 is 4 066 873 189 201 because 2 016 649 × 2 016 649 = 2 016 6492 = 4 066 873 189 201.
As a consequence, 2 016 649 is the square root of 4 066 873 189 201.
The multiples of 2 016 649 are all integers evenly divisible by 2 016 649, that is all numbers such that the remainder of the division by 2 016 649 is zero. There are infinitely many multiples of 2 016 649. The smallest multiples of 2 016 649 are: