It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 6 403 242 is not a prime number.
For example, 6 403 242 can be divided by 2: 6 403 242 / 2 = 3 201 621.
For 6 403 242 to be a prime number, it would have been required that 6 403 242 has only two divisors, i.e., itself and 1.
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6 403 242 is an even number, because it is evenly divisible by 2: 6 403 242 / 2 = 3 201 621.
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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 6 403 242 is about 2 530.463.
Thus, the square root of 6 403 242 is not an integer, and therefore 6 403 242 is not a square number.
The square of a number (here 6 403 242) is the result of the product of this number (6 403 242) by itself (i.e., 6 403 242 × 6 403 242); the square of 6 403 242 is sometimes called "raising 6 403 242 to the power 2", or "6 403 242 squared".
The square of 6 403 242 is 41 001 508 110 564 because 6 403 242 × 6 403 242 = 6 403 2422 = 41 001 508 110 564.
As a consequence, 6 403 242 is the square root of 41 001 508 110 564.
The multiples of 6 403 242 are all integers evenly divisible by 6 403 242, that is all numbers such that the remainder of the division by 6 403 242 is zero. There are infinitely many multiples of 6 403 242. The smallest multiples of 6 403 242 are: