It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 6 788 988 is not a prime number.
For example, 6 788 988 can be divided by 2: 6 788 988 / 2 = 3 394 494.
For 6 788 988 to be a prime number, it would have been required that 6 788 988 has only two divisors, i.e., itself and 1.
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6 788 988 is an even number, because it is evenly divisible by 2: 6 788 988 / 2 = 3 394 494.
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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 6 788 988 is about 2 605.569.
Thus, the square root of 6 788 988 is not an integer, and therefore 6 788 988 is not a square number.
The square of a number (here 6 788 988) is the result of the product of this number (6 788 988) by itself (i.e., 6 788 988 × 6 788 988); the square of 6 788 988 is sometimes called "raising 6 788 988 to the power 2", or "6 788 988 squared".
The square of 6 788 988 is 46 090 358 064 144 because 6 788 988 × 6 788 988 = 6 788 9882 = 46 090 358 064 144.
As a consequence, 6 788 988 is the square root of 46 090 358 064 144.
The multiples of 6 788 988 are all integers evenly divisible by 6 788 988, that is all numbers such that the remainder of the division by 6 788 988 is zero. There are infinitely many multiples of 6 788 988. The smallest multiples of 6 788 988 are: