A gym teacher has 2,138 students. If she groups them into pairs, will any student be left without a partner?

Yes, because the first digit is odd.

No, because the number ends in 8.

Yes, because the number contains a 3.

No, because the number is very large.

Which statement correctly explains why the number 7,432 is even?

Because its first digit, 7, is odd.

Because it contains the odd digit 3.

Because its last digit, 2, is an even digit.

Because the sum of its digits is 16.