It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 8 429 421 is not a prime number.
For example, 8 429 421 can be divided by 3: 8 429 421 / 3 = 2 809 807.
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For 8 429 421 to be a prime number, it would have been required that 8 429 421 has only two divisors, i.e., itself and 1.
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8 429 421 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 8 429 421 is about 2 903.347.
Thus, the square root of 8 429 421 is not an integer, and therefore 8 429 421 is not a square number.
The square of a number (here 8 429 421) is the result of the product of this number (8 429 421) by itself (i.e., 8 429 421 × 8 429 421); the square of 8 429 421 is sometimes called "raising 8 429 421 to the power 2", or "8 429 421 squared".
The square of 8 429 421 is 71 055 138 395 241 because 8 429 421 × 8 429 421 = 8 429 4212 = 71 055 138 395 241.
As a consequence, 8 429 421 is the square root of 71 055 138 395 241.
The multiples of 8 429 421 are all integers evenly divisible by 8 429 421, that is all numbers such that the remainder of the division by 8 429 421 is zero. There are infinitely many multiples of 8 429 421. The smallest multiples of 8 429 421 are: