It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 7 428 489 is not a prime number.
For example, 7 428 489 can be divided by 3: 7 428 489 / 3 = 2 476 163.
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For 7 428 489 to be a prime number, it would have been required that 7 428 489 has only two divisors, i.e., itself and 1.
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7 428 489 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 7 428 489 is about 2 725.525.
Thus, the square root of 7 428 489 is not an integer, and therefore 7 428 489 is not a square number.
The square of a number (here 7 428 489) is the result of the product of this number (7 428 489) by itself (i.e., 7 428 489 × 7 428 489); the square of 7 428 489 is sometimes called "raising 7 428 489 to the power 2", or "7 428 489 squared".
The square of 7 428 489 is 55 182 448 823 121 because 7 428 489 × 7 428 489 = 7 428 4892 = 55 182 448 823 121.
As a consequence, 7 428 489 is the square root of 55 182 448 823 121.
The multiples of 7 428 489 are all integers evenly divisible by 7 428 489, that is all numbers such that the remainder of the division by 7 428 489 is zero. There are infinitely many multiples of 7 428 489. The smallest multiples of 7 428 489 are: