It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 7 639 664 is not a prime number.
For example, 7 639 664 can be divided by 2: 7 639 664 / 2 = 3 819 832.
For 7 639 664 to be a prime number, it would have been required that 7 639 664 has only two divisors, i.e., itself and 1.
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7 639 664 is an even number, because it is evenly divisible by 2: 7 639 664 / 2 = 3 819 832.
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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 7 639 664 is about 2 763.994.
Thus, the square root of 7 639 664 is not an integer, and therefore 7 639 664 is not a square number.
The square of a number (here 7 639 664) is the result of the product of this number (7 639 664) by itself (i.e., 7 639 664 × 7 639 664); the square of 7 639 664 is sometimes called "raising 7 639 664 to the power 2", or "7 639 664 squared".
The square of 7 639 664 is 58 364 466 032 896 because 7 639 664 × 7 639 664 = 7 639 6642 = 58 364 466 032 896.
As a consequence, 7 639 664 is the square root of 58 364 466 032 896.
The multiples of 7 639 664 are all integers evenly divisible by 7 639 664, that is all numbers such that the remainder of the division by 7 639 664 is zero. There are infinitely many multiples of 7 639 664. The smallest multiples of 7 639 664 are: