It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 8 216 741 is not a prime number.
For example, 8 216 741 can be divided by 13: 8 216 741 / 13 = 632 057.
For 8 216 741 to be a prime number, it would have been required that 8 216 741 has only two divisors, i.e., itself and 1.
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8 216 741 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 8 216 741 is about 2 866.486.
Thus, the square root of 8 216 741 is not an integer, and therefore 8 216 741 is not a square number.
The square of a number (here 8 216 741) is the result of the product of this number (8 216 741) by itself (i.e., 8 216 741 × 8 216 741); the square of 8 216 741 is sometimes called "raising 8 216 741 to the power 2", or "8 216 741 squared".
The square of 8 216 741 is 67 514 832 661 081 because 8 216 741 × 8 216 741 = 8 216 7412 = 67 514 832 661 081.
As a consequence, 8 216 741 is the square root of 67 514 832 661 081.
The multiples of 8 216 741 are all integers evenly divisible by 8 216 741, that is all numbers such that the remainder of the division by 8 216 741 is zero. There are infinitely many multiples of 8 216 741. The smallest multiples of 8 216 741 are: